question_answer 1)
Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively [MP PMT 1997]
A)
\[Mn{{O}_{2}},Mn{{O}_{2}},M{{n}^{2+}}\] done
clear
B)
\[MnO_{4}^{2-},M{{n}^{3+}},M{{n}^{2+}}\] done
clear
C)
\[Mn{{O}_{2}},MnO_{4}^{2-},M{{n}^{3+}}\] done
clear
D)
\[MnO,Mn{{O}_{4}},M{{n}^{2+}}\] done
clear
View Solution play_arrow
question_answer 2)
In acidic medium one mole of \[MnO_{4}^{-}\] accepts how many moles of electrons in a redox process? [MP PET/PMT 1998]
A)
1 done
clear
B)
3 done
clear
C)
5 done
clear
D)
6 done
clear
View Solution play_arrow
question_answer 3)
In acidic medium potassium dichromate acts as an oxidant according to the equation, \[C{{r}_{2}}O_{7}^{2-}+14{{H}^{+}}+6{{e}^{-}}\to 2C{{r}^{3+}}+7{{H}_{2}}O\]. What is the equivalent weight of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]? (mol. Wt. = M) [MP PET/PMT 1998]
A)
\[M\] done
clear
B)
\[M/2\] done
clear
C)
\[M/3\] done
clear
D)
\[M/6\] done
clear
View Solution play_arrow
question_answer 4)
The correct formula of permanganic acid is [MP PET 1999]
A)
\[HMn{{O}_{4}}\] done
clear
B)
\[HMn{{O}_{5}}\] done
clear
C)
\[{{H}_{2}}Mn{{O}_{4}}\] done
clear
D)
\[{{H}_{2}}Mn{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 5)
Acidified potassium dichromate is treated with hydrogen sulphide. In the reaction, the oxidation number of chromium [MP PET 1996]
A)
Increases from + 3 to + 6 done
clear
B)
Decreases from +6 to +3 done
clear
C)
Remains unchanged done
clear
D)
Decreases from +6 to +2 done
clear
View Solution play_arrow
question_answer 6)
When \[KMn{{O}_{4}}\] reacts with acidified \[FeS{{O}_{4}}\] [MP PET 1996]
A)
Only \[FeS{{O}_{4}}\] is oxidised done
clear
B)
Only \[KMn{{O}_{4}}\] is oxidised done
clear
C)
\[FeS{{O}_{4}}\] is oxidised \[KMn{{O}_{4}}\] and is reduced done
clear
D)
None of these done
clear
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question_answer 7)
When calomel reacts with \[N{{H}_{4}}OH,\] we get [CBSE PMT 1996]
A)
\[HgN{{H}_{2}}Cl\] done
clear
B)
\[N{{H}_{2}}-Hg-Hg-Cl\] done
clear
C)
\[H{{g}_{2}}O\] done
clear
D)
\[HgO\] done
clear
View Solution play_arrow
question_answer 8)
\[AgCl\] dissolves in a solution of \[N{{H}_{3}}\] but not in water because [MP PMT 1984, 86]
A)
\[N{{H}_{3}}\] is a better solvent than \[{{H}_{2}}O\] done
clear
B)
\[A{{g}^{+}}\] forms a complex ion with \[N{{H}_{3}}\] done
clear
C)
\[N{{H}_{3}}\] is a stronger base than \[{{H}_{2}}O\] done
clear
D)
The dipole moment of water is higher than \[N{{H}_{3}}\] done
clear
View Solution play_arrow
question_answer 9)
In solid \[CuS{{O}_{4}}.5{{H}_{2}}O\] copper is co-ordinated to [MP PET 1985, 86]
A)
Five water molecules done
clear
B)
Four water molecules done
clear
C)
One sulphate anion done
clear
D)
One water molecule done
clear
View Solution play_arrow
question_answer 10)
A white powder soluble in \[N{{H}_{4}}OH\] but insoluble in water is [AFMC 1987]
A)
\[BaS{{O}_{4}}\] done
clear
B)
\[CuS{{O}_{4}}\] done
clear
C)
\[PbS{{O}_{4}}\] done
clear
D)
\[AgCl\] done
clear
View Solution play_arrow
question_answer 11)
Verdigris is [BHU 1987]
A)
Basic copper acetate done
clear
B)
Basic lead acetate done
clear
C)
Basic lead done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 12)
Number of moles of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] reduced by one mole of \[S{{n}^{2+}}\] ions is [KCET 1996]
A)
1/3 done
clear
B)
3 done
clear
C)
1.6 done
clear
D)
6 done
clear
View Solution play_arrow
question_answer 13)
Which one of the following is reduced by hydrogen peroxide in acid medium [EAMCET 1997]
A)
Potassium permanganate done
clear
B)
Potassium iodide done
clear
C)
Ferrous sulphate done
clear
D)
Potassium ferrocyanide done
clear
View Solution play_arrow
question_answer 14)
Which oxide of manganese is amphoteric [AFMC 1995]
A)
\[Mn{{O}_{2}}\] done
clear
B)
\[M{{n}_{2}}{{O}_{3}}\] done
clear
C)
\[M{{n}_{2}}{{O}_{7}}\] done
clear
D)
\[MnO\] done
clear
View Solution play_arrow
question_answer 15)
Which one of the following oxides is ionic [IIT-JEE 1995]
A)
\[MnO\] done
clear
B)
\[M{{n}_{2}}{{O}_{7}}\] done
clear
C)
\[Cr{{O}_{3}}\] done
clear
D)
\[{{P}_{2}}{{O}_{5}}\] done
clear
View Solution play_arrow
question_answer 16)
Correct formula of calomel is [CPMT 1994; AFMC 1998]
A)
\[H{{g}_{2}}C{{l}_{2}}\] done
clear
B)
\[HgC{{l}_{2}}\] done
clear
C)
\[HgC{{l}_{2}}.{{H}_{2}}O\] done
clear
D)
\[HgS{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 17)
One of the important use of ferrous sulphate is in the
A)
Manufacture of blue black ink done
clear
B)
Manufacture of chalks done
clear
C)
Preparation of hydrogen sulphide done
clear
D)
Preparation of anhydrous ferric chloride done
clear
View Solution play_arrow
question_answer 18)
Copper sulphate is not used
A)
In electrotyping done
clear
B)
In dyeing and calicoprinting done
clear
C)
In detecting water done
clear
D)
As fertilizer done
clear
View Solution play_arrow
question_answer 19)
Blue vitriol is [AFMC 1992]
A)
\[CuS{{O}_{4}}\] done
clear
B)
\[CuS{{O}_{4}}.5{{H}_{2}}O\] done
clear
C)
\[C{{u}_{2}}S{{O}_{4}}\] done
clear
D)
\[CuS{{O}_{4}}.{{H}_{2}}O\] done
clear
View Solution play_arrow
question_answer 20)
A solution of copper sulphate may be kept safely in the container made up of
A)
\[Fe\] done
clear
B)
\[Ag\] done
clear
C)
\[Zn\] done
clear
D)
\[Al\] done
clear
View Solution play_arrow
question_answer 21)
Silver nitrate produces a black stain on skin due to
A)
Being a strong reducing agent done
clear
B)
Its corrosive action done
clear
C)
Formation of complex compound done
clear
D)
Its reduction to metallic silver done
clear
View Solution play_arrow
question_answer 22)
When hypo solution is added to cupric sulphate solution, the blue colour of the latter is discharged, due to formation of
A)
\[Cu{{S}_{2}}{{O}_{3}}\] done
clear
B)
\[N{{a}_{2}}{{S}_{4}}{{O}_{6}}\] done
clear
C)
\[NaCu{{S}_{2}}{{O}_{3}}\] done
clear
D)
\[C{{u}_{2}}O\] done
clear
View Solution play_arrow
question_answer 23)
Metal oxides which decomposes on heating is [MNR 1984; UPSEAT 1999]
A)
\[ZnO\] done
clear
B)
\[A{{l}_{2}}{{O}_{3}}\] done
clear
C)
\[CuO\] done
clear
D)
\[N{{a}_{2}}O\] done
clear
E)
\[HgO\] done
clear
View Solution play_arrow
question_answer 24)
Anhydrous sample of ferric chloride is prepared by heating
A)
\[Fe+HCl\] done
clear
B)
\[Fe+C{{l}_{2}}\] done
clear
C)
\[FeC{{l}_{2}}+C{{l}_{2}}\] done
clear
D)
Hydrated ferric chloride done
clear
View Solution play_arrow
question_answer 25)
Light green crystals of ferrous sulphate lose water molecule and turn brown on exposure to air. This is due to its oxidation to
A)
\[F{{e}_{2}}{{O}_{3}}\] done
clear
B)
\[F{{e}_{2}}{{O}_{3}}.{{H}_{2}}O\] done
clear
C)
\[Fe(OH)S{{O}_{4}}\] done
clear
D)
\[F{{e}_{2}}{{O}_{3}}+FeO\] done
clear
View Solution play_arrow
question_answer 26)
In alkaline condition \[KMn{{O}_{4}},\] reacts as follows : \[2KMn{{O}_{4}}+2KOH\to 2{{K}_{2}}Mn{{O}_{4}}+{{H}_{2}}O+O\] Therefore its equivalent weight will be [NCERT 1974; CPMT 1977; DCE 2002]
A)
31.5 done
clear
B)
52.7 done
clear
C)
72.0 done
clear
D)
158.0 done
clear
View Solution play_arrow
question_answer 27)
Equivalent weight of \[KMn{{O}_{4}}\] acting as an oxidant in acidic medium is equal to [CPMT 1990; MP PMT 1999]
A)
Molecular weight of \[KMn{{O}_{4}}\] done
clear
B)
\[\frac{1}{2}\]´ Molecular weight of \[KMn{{O}_{4}}\] done
clear
C)
\[\frac{1}{3}\]´ Molecular weight of \[KMn{{O}_{4}}\] done
clear
D)
\[\frac{1}{5}\]´ Molecular weight of \[KMn{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 28)
In which of the following ionic radii of chromium would be smallest [MP PET 1994]
A)
\[{{K}_{2}}Cr{{O}_{4}}\] done
clear
B)
\[Cr{{O}_{2}}\] done
clear
C)
\[CrC{{l}_{3}}\] done
clear
D)
\[Cr{{F}_{2}}\] done
clear
View Solution play_arrow
question_answer 29)
\[CoO.A{{l}_{2}}{{O}_{3}}\] is called
A)
Cobalt aluminate done
clear
B)
Thenard's blue done
clear
C)
Both A and B done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 30)
\[ZnO.CoO\] is called
A)
Cobalt zincate done
clear
B)
Rinman's green done
clear
C)
Both A and B done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 31)
\[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\] is called [Bihar CEE 1995]
A)
Mohr's salt done
clear
B)
Green salt done
clear
C)
Alum done
clear
D)
Glauber's salt done
clear
View Solution play_arrow
question_answer 32)
Molybdenum compounds are used in
A)
Dye industry done
clear
B)
For colouring leather done
clear
C)
For colouring rubber done
clear
D)
All of these done
clear
View Solution play_arrow
question_answer 33)
When copper turnings and concentrated \[HCl\] is heated with copper sulphate the compound formed is [CPMT 1984]
A)
Cupric chloride done
clear
B)
Cuprous chloride done
clear
C)
Copper sulphate done
clear
D)
\[S{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 34)
s The compound of copper which turns green on keeping in air is [CPMT 1984]
A)
Copper sulphate done
clear
B)
Copper nitrate done
clear
C)
Cupric chloride done
clear
D)
Cuprous chloride done
clear
View Solution play_arrow
question_answer 35)
\[C{{u}_{2}}C{{l}_{2}}\] with \[HCl\] in presence of oxidising agents gives [CPMT 1984]
A)
\[CuC{{l}_{2}}\] done
clear
B)
\[{{H}_{2}}CuC{{l}_{2}}\] done
clear
C)
Hydrogen gas done
clear
D)
Chlorine gas done
clear
View Solution play_arrow
question_answer 36)
\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] on heating with aqueous \[NaOH\] gives [CBSE PMT 1997]
A)
\[CrO_{4}^{2-}\] done
clear
B)
\[Cr{{(OH)}_{3}}\] done
clear
C)
\[C{{r}_{2}}O_{7}^{2-}\] done
clear
D)
\[Cr{{(OH)}_{2}}\] done
clear
View Solution play_arrow
question_answer 37)
\[KMn{{O}_{4}}\] reacts with oxalic acid according to the equation : \[2MnO_{4}^{-}+5{{C}_{2}}O_{4}^{2-}+16{{H}^{+}}\to 2M{{n}^{2+}}+10C{{O}_{2}}+8{{H}_{2}}O\] Here 20 ml of 0.1 M \[KMn{{O}_{4}}\] is equivalent to [CBSE PMT 1996]
A)
\[20ml\] of 0.5 M \[{{C}_{2}}{{H}_{2}}{{O}_{4}}\] done
clear
B)
\[50ml\] of 0.1 M \[{{C}_{2}}{{H}_{2}}{{O}_{4}}\] done
clear
C)
\[50ml\] of 0.5 M \[{{C}_{2}}{{H}_{2}}{{O}_{4}}\] done
clear
D)
\[20ml\] of 0.1 M \[{{C}_{2}}{{H}_{2}}{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 38)
The equivalent weight of potassium permanganate for acid solution is [MP PET 1999]
A)
158 done
clear
B)
31.6 done
clear
C)
52.16 done
clear
D)
79 done
clear
View Solution play_arrow
question_answer 39)
Which statement is not correct [MP PET 1999]
A)
Potassium permanganate is a powerful oxidising substance done
clear
B)
Potassium permanganate is a weaker oxidising substance than potassium dichromate done
clear
C)
Potassium permanganate is a stronger oxidising substance than potassium dichromate done
clear
D)
Potassium dichromate oxidises a secondary alcohol into a ketone done
clear
View Solution play_arrow
question_answer 40)
The formula of corrosive sublimate is [CPMT 1997]
A)
\[HgC{{l}_{2}}\] done
clear
B)
\[H{{g}_{2}}C{{l}_{2}}\] done
clear
C)
\[H{{g}_{2}}O\] done
clear
D)
\[Hg\] done
clear
View Solution play_arrow
question_answer 41)
Which is mild oxidising agent [AFMC 1971]
A)
\[A{{g}_{2}}O\] done
clear
B)
\[KMn{{O}_{4}}\] done
clear
C)
\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] done
clear
D)
\[C{{l}_{2}}\] done
clear
View Solution play_arrow
question_answer 42)
The equivalent weight of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] in acidic medium
A)
294 done
clear
B)
298 done
clear
C)
49 done
clear
D)
50 done
clear
View Solution play_arrow
question_answer 43)
The transitional element of III-B group is isomorphic with \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\]. Therefore the compound will be
A)
Purple done
clear
B)
Blue done
clear
C)
White done
clear
D)
Uncertain done
clear
View Solution play_arrow
question_answer 44)
A copper salt is isomorphic with \[ZnS{{O}_{4}}\], the salt will be
A)
Paramagnetic done
clear
B)
Diamagnetic done
clear
C)
Ferromagnetic done
clear
D)
None done
clear
View Solution play_arrow
question_answer 45)
\[{{V}_{2}}{{O}_{5}}\] is useful as catalyst in
A)
Manufacture of \[{{H}_{2}}S{{O}_{4}}\] done
clear
B)
Manufacture of \[HN{{O}_{3}}\] done
clear
C)
Manufacture of \[N{{a}_{2}}C{{O}_{3}}\] done
clear
D)
It is not a catalyst done
clear
View Solution play_arrow
question_answer 46)
\[KMn{{O}_{4}}\] in basic medium is reduced to [Orissa JEE 2005]
A)
\[{{K}_{2}}Mn{{O}_{4}}\] done
clear
B)
\[Mn{{O}_{2}}\] done
clear
C)
\[Mn{{(OH)}_{2}}\] done
clear
D)
\[M{{n}^{2+}}\] done
clear
View Solution play_arrow
question_answer 47)
When \[KMn{{O}_{4}}\] is reduced with oxalic acid in acidic solution, the oxidation number of \[Mn\] changes from [CPMT 1989]
A)
7 to 4 done
clear
B)
6 to 4 done
clear
C)
7 to 2 done
clear
D)
4 to 2 done
clear
View Solution play_arrow
question_answer 48)
. Nesseler's reagent is [MP PET 1991; MP PMT 1993; AFMC 2001]
A)
\[{{K}_{2}}Hg{{I}_{4}}\] done
clear
B)
\[{{K}_{2}}Hg{{I}_{4}}+KOH\] done
clear
C)
\[{{K}_{2}}Hg{{I}_{2}}+KOH\] done
clear
D)
\[{{K}_{2}}Hg{{I}_{4}}+Hg\] done
clear
View Solution play_arrow
question_answer 49)
When ammonium dichromate is heated, the gas formed is [MP PMT 1993; IIT-JEE 1999]
A)
\[{{N}_{2}}\] done
clear
B)
\[{{O}_{2}}\] done
clear
C)
\[{{H}_{2}}\] done
clear
D)
\[N{{H}_{3}}\] done
clear
View Solution play_arrow
question_answer 50)
Acidified potassium dichromate on reacting with a sulphite is reduced to
A)
\[Cr{{O}_{2}}C{{l}_{2}}\] done
clear
B)
\[CrO_{4}^{2-}\] done
clear
C)
\[C{{r}^{3+}}\] done
clear
D)
\[C{{r}^{2+}}\] done
clear
View Solution play_arrow
question_answer 51)
The product of oxidation of \[{{I}^{-}}\] ion by \[MnO_{4}^{-}\] in alkaline medium is
A)
\[{{I}_{2}}\] done
clear
B)
\[IO_{3}^{-}\] done
clear
C)
\[IO_{4}^{-}\] done
clear
D)
\[I_{3}^{-}\] done
clear
View Solution play_arrow
question_answer 52)
Identify the statement which is not correct regarding copper sulphate [UPSEAT 2000, 01]
A)
It reacts with KI to give iodine done
clear
B)
It reacts with KCl to give \[C{{u}_{2}}C{{l}_{2}}\] done
clear
C)
It reacts with NaOH and glucose to give \[C{{u}_{2}}O\] done
clear
D)
It give CuO on strong heating in air done
clear
View Solution play_arrow
question_answer 53)
Acidified potassium permanganate solution is decolourised by [MNR 1984]
A)
Bleaching powder done
clear
B)
White vitriol done
clear
C)
Mohr's salt done
clear
D)
Microcosmic salt done
clear
E)
Laughing gas done
clear
View Solution play_arrow
question_answer 54)
Which of the following oxides is white but becomes yellow on heating [MP PET 1995]
A)
\[AgO\] done
clear
B)
\[A{{g}_{2}}O\] done
clear
C)
\[FeO\] done
clear
D)
\[ZnO\] done
clear
View Solution play_arrow
question_answer 55)
Amalgams are
A)
Highly coloured alloys done
clear
B)
Always solid done
clear
C)
Alloys which contain mercury as one of the contents done
clear
D)
Alloys which have great resistance to abrasion done
clear
View Solution play_arrow
question_answer 56)
In photography sodium thiosulphate is used as [DPMT 2005]
A)
Complexing agent done
clear
B)
Oxidising agent done
clear
C)
Reducing agent done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 57)
The substance that sublimes on heating [EAMCET 1978, 82; MP PMT 1999]
A)
Magnesium chloride done
clear
B)
Silver chloride done
clear
C)
Mercurous chloride done
clear
D)
Sodium chloride done
clear
View Solution play_arrow
question_answer 58)
\[{{K}_{3}}\left[ Fe{{(CN)}_{6}} \right]\] is called
A)
Potassium ferricyanide done
clear
B)
Red prussiate of potash done
clear
C)
Potassium hexacyanoferrate (III) done
clear
D)
All of these done
clear
View Solution play_arrow
question_answer 59)
Which of the following will show increase in weight when kept in magnetic field
A)
\[Ti{{O}_{2}}\] done
clear
B)
\[F{{e}_{2}}{{(S{{O}_{4}})}_{3}}\] done
clear
C)
\[KMn{{O}_{4}}\] done
clear
D)
\[ScC{{l}_{3}}\] done
clear
View Solution play_arrow
question_answer 60)
Amongst \[TiF_{6}^{2-},CoF_{6}^{3-},C{{u}_{2}}C{{l}_{2}}\] and \[NiCl_{4}^{2-}\] (Atomic number \[Ti=22,\] \[Co=27,\] \[Cu=29,\] \[Ni=28\]). The colourless species are [CBSE PMT 1995]
A)
\[CoF_{6}^{3-}\] and \[NiCl_{4}^{2-}\] done
clear
B)
\[TiF_{6}^{2-}\] and \[CoF_{6}^{3-}\] done
clear
C)
\[C{{u}_{2}}C{{l}_{2}}\] and \[NiCl_{4}^{2-}\] done
clear
D)
\[TiF_{6}^{2-}\] and \[C{{u}_{2}}C{{l}_{2}}\] done
clear
View Solution play_arrow
question_answer 61)
Which of the following imparts green colour to the glass [CPMT 1993]
A)
\[C{{u}_{2}}O\] done
clear
B)
\[CdS\] done
clear
C)
\[Mn{{O}_{2}}\] done
clear
D)
\[C{{r}_{2}}{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 62)
On the heating copper nitrate strongly, ....... is finally obtained [CPMT 1971, 74, 78]
A)
Copper done
clear
B)
Copper oxide done
clear
C)
Copper nitrate done
clear
D)
Copper nitride done
clear
View Solution play_arrow
question_answer 63)
On adding KI to a solution of copper sulphate [CPMT 1973; NCERT 1977; MP PMT 1989]
A)
Cupric oxide is precipitated done
clear
B)
Metallic copper is precipitated done
clear
C)
Cuprous iodide is precipitated with liberation of iodine done
clear
D)
No change occurs done
clear
View Solution play_arrow
question_answer 64)
Which of the following statements is correct about equivalent weight of \[KMn{{O}_{4}}\] [MP PET 1994]
A)
It is one third of its molecular weight in alkaline medium done
clear
B)
It is one fifth of its molecular weight in alkaline medium done
clear
C)
It is equal to its molecular weight in acidic medium done
clear
D)
It is one third of its molecular weight in acidic medium done
clear
View Solution play_arrow
question_answer 65)
The reaction of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] with \[NaCl\] and conc. \[{{H}_{2}}S{{O}_{4}}\] gives [MP PET 1994]
A)
\[CrC{{l}_{3}}\] done
clear
B)
\[CrOC{{l}_{2}}\] done
clear
C)
\[Cr{{O}_{2}}C{{l}_{2}}\] done
clear
D)
\[C{{r}_{2}}{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 66)
Silver nitrate is supplied in coloured bottles because it is [CPMT 1985]
A)
Oxidised in air done
clear
B)
Decomposes in sunlight done
clear
C)
Explosive in sunlight done
clear
D)
Reactive towards air in sunlight done
clear
View Solution play_arrow
question_answer 67)
A nitrate when mixed with common salt gives a white precipitate which is soluble in dilute \[N{{H}_{4}}OH\]. It is the nitrate of [CPMT 1985]
A)
Copper done
clear
B)
Mercury done
clear
C)
Silver done
clear
D)
Gold done
clear
View Solution play_arrow
question_answer 68)
Which one of the following is lunar caustic [CPMT 1984]
A)
\[AgN{{O}_{3}}\] done
clear
B)
\[C{{u}_{2}}C{{l}_{2}}\] done
clear
C)
\[CuC{{l}_{2}}\] done
clear
D)
\[H{{g}_{2}}C{{l}_{_{2}}}\] done
clear
View Solution play_arrow
question_answer 69)
Invar, an alloy of Fe and Ni is used in watches and meter scale, its characteristic property is [Kerala (Engg.) 2002]
A)
Small coefficient of expansion done
clear
B)
Resistance to corrosion done
clear
C)
Hardness and elasticity done
clear
D)
Magnetic nature done
clear
View Solution play_arrow
question_answer 70)
The extraction of nickel involves
A)
The formation of \[Ni{{(CO)}_{4}}\] done
clear
B)
The decomposition of \[Ni{{(CO)}_{4}}\] done
clear
C)
The formation and thermal decomposition of \[Ni{{(CO)}_{4}}\] done
clear
D)
The formation and catalytic decomposition of \[Ni{{(CO)}_{4}}\] done
clear
View Solution play_arrow
question_answer 71)
On adding excess of \[N{{H}_{3}}\] solution to \[CuS{{O}_{4}}\] solution, the dark blue colour is due to [CPMT 1990; AIIMS 1982; MP PMT 1989, 92; BHU 1996; JIPMER 1997]
A)
\[{{\left[ Cu{{(N{{H}_{3}})}_{4}} \right]}^{++}}\] done
clear
B)
\[{{\left[ Cu{{(N{{H}_{3}})}_{2}} \right]}^{++}}\] done
clear
C)
\[{{\left[ Cu(N{{H}_{3}}) \right]}^{+}}\] done
clear
D)
None of the above done
clear
View Solution play_arrow
question_answer 72)
If M is the molecular weight of \[KMn{{O}_{4}}\], its equivalent weight will be when it is converted into \[{{K}_{2}}Mn{{O}_{4}}\] [MP PET 1993]
A)
M done
clear
B)
M/3 done
clear
C)
M/5 done
clear
D)
M/7 done
clear
View Solution play_arrow
question_answer 73)
While writing the formula of ferrous oxide it is written as \[(FeO),\] because it is
A)
Non-stoichiometric done
clear
B)
Non-existant done
clear
C)
Paramagnetic done
clear
D)
Ferromagnetic done
clear
View Solution play_arrow
question_answer 74)
Which of the following exhibit maximum oxidation state of vanadium
A)
\[VOC{{l}_{3}}\] done
clear
B)
\[VC{{l}_{4}}\] done
clear
C)
\[VC{{l}_{3}}\] done
clear
D)
\[VC{{l}_{2}}\] done
clear
View Solution play_arrow
question_answer 75)
Prussian blue is due to the formation of [BHU 1980; CBSE PMT 1990; KCET 1992; MP PET 1995]
A)
\[F{{e}_{4}}{{\left[ Fe{{(CN)}_{6}} \right]}_{3}}\] done
clear
B)
\[F{{e}_{2}}\left[ Fe{{(CN)}_{6}} \right]\] done
clear
C)
\[F{{e}_{3}}\left[ Fe{{(CN)}_{6}} \right]\] done
clear
D)
\[Fe{{\left[ Fe{{(CN)}_{6}} \right]}_{3}}\] done
clear
View Solution play_arrow
question_answer 76)
The Nesseler's reagent contains [CPMT 1976, 88; NCERT 1987; MP PMT 1985; BHU 1996]
A)
\[Hg_{2}^{++}\] done
clear
B)
\[H{{g}^{++}}\] done
clear
C)
\[Hg{{I}_{2}}^{--}\] done
clear
D)
\[Hg{{I}_{4}}^{--}\] done
clear
View Solution play_arrow
question_answer 77)
Formula of ferric sulphate is [AFMC 2003]
A)
\[FeS{{O}_{4}}\] done
clear
B)
\[Fe\,\,{{(S{{O}_{4}})}_{2}}\] done
clear
C)
\[F{{e}_{2}}S{{O}_{4}}\] done
clear
D)
\[F{{e}_{2}}\,{{(S{{O}_{4}})}_{3}}\] done
clear
View Solution play_arrow
question_answer 78)
When \[CuS{{O}_{4}}\] is hydrated, then it becomes [AFMC 2003]
A)
Acidic done
clear
B)
basic done
clear
C)
Neutral done
clear
D)
Amphoteric done
clear
View Solution play_arrow
question_answer 79)
Silvering of mirror is done by [AFMC 2003]
A)
\[AgN{{O}_{3}}\] done
clear
B)
\[A{{g}_{2}}{{O}_{3}}\] done
clear
C)
\[F{{e}_{2}}{{O}_{3}}\] done
clear
D)
\[A{{l}_{2}}{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 80)
The colour of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] changes from red orange to lemon yellow on treatment with aqueous \[KOH\] because of [MP PMT 1994]
A)
The reduction of \[C{{r}^{VI}}\] to \[C{{r}^{III}}\] done
clear
B)
The formation of chromium hydroxide done
clear
C)
The conversion of dichromate to chromate done
clear
D)
The oxidation of potassium hydroxide to potassium peroxide done
clear
View Solution play_arrow
question_answer 81)
On heating pyrollusite with \[KOH\] in presence of air we get
A)
\[KMn{{O}_{4}}\] done
clear
B)
\[{{K}_{2}}Mn{{O}_{4}}\] done
clear
C)
\[Mn{{(OH)}_{2}}\] done
clear
D)
\[M{{n}_{3}}{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 82)
\[Cu(CN)_{4}^{2-}\] is colourless as it absorbs light in
A)
Visible region done
clear
B)
Ultraviolet region done
clear
C)
Infrared region done
clear
D)
All above are wrong done
clear
View Solution play_arrow
question_answer 83)
Acidified solution of chromic acid on treatment with hydrogen peroxide yields [MP PET 1999; AFMC 2000]
A)
\[Cr{{O}_{3}}+{{H}_{2}}O+{{O}_{2}}\] done
clear
B)
\[C{{r}_{2}}{{O}_{3}}+{{H}_{2}}O+{{O}_{2}}\] done
clear
C)
\[Cr{{O}_{5}}+{{H}_{2}}O\] done
clear
D)
\[{{H}_{2}}C{{r}_{2}}{{O}_{7}}+{{H}_{2}}O+{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 84)
Which of the following metals corrodes readily in moist air [CPMT 1972, 82; CBSE PMT 1989]
A)
Gold done
clear
B)
Silver done
clear
C)
Nickel done
clear
D)
Iron done
clear
View Solution play_arrow
question_answer 85)
Which one of the following compounds is not coloured [AIIMS 1997]
A)
\[N{{a}_{2}}CuC{{l}_{4}}\] done
clear
B)
\[N{{a}_{2}}CdC{{l}_{4}}\] done
clear
C)
\[{{K}_{4}}Fe{{(CN)}_{6}}\] done
clear
D)
\[{{K}_{3}}Fe{{(CN)}_{6}}\] done
clear
View Solution play_arrow
question_answer 86)
Acidified \[KMn{{O}_{4}}\] is decolourzed by [AMU 1999]
A)
\[B{{r}_{2}}\] done
clear
B)
\[{{O}_{3}}\] done
clear
C)
HCl done
clear
D)
HBr done
clear
View Solution play_arrow
question_answer 87)
Which of the following compound expected to be colourless
A)
\[ScO\] done
clear
B)
\[{{V}_{2}}{{O}_{3}}\] done
clear
C)
\[CuCN\] done
clear
D)
\[C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\] done
clear
View Solution play_arrow
question_answer 88)
Crystals of which pair are isomorphous [CPMT 1990]
A)
\[ZnS{{O}_{4}},\] \[SnS{{O}_{4}}\] done
clear
B)
\[MgS{{O}_{4}},\] \[CaS{{O}_{4}}\] done
clear
C)
\[ZnS{{O}_{4}},\] \[MgS{{O}_{4}}\] done
clear
D)
\[PbS{{O}_{4}},\] \[NiS{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 89)
On heating \[Mn{{(OH)}_{2}}\] with \[Pb{{O}_{2}}\] and conc. \[HN{{O}_{3}}\] pink colour is obtained due to the formation of [MP PET 1995]
A)
\[KMn{{O}_{4}}\] done
clear
B)
\[HMn{{O}_{4}}\] done
clear
C)
\[Pb{{(Mn{{O}_{4}})}_{2}}\] done
clear
D)
\[PbMn{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 90)
Which of the following is used as white pigment
A)
\[Ti{{O}_{2}}\] done
clear
B)
\[{{V}_{2}}{{O}_{5}}\] done
clear
C)
\[CuO\] done
clear
D)
\[HgO\] done
clear
View Solution play_arrow
question_answer 91)
Which metal oxide is used to make blue glass
A)
\[F{{e}_{2}}{{O}_{3}}\] done
clear
B)
\[CoO\] done
clear
C)
\[C{{u}_{2}}O\] done
clear
D)
\[NiO\] done
clear
View Solution play_arrow
question_answer 92)
The chemical formula for certain pyrophosphate is \[C{{a}_{2}}{{P}_{2}}{{O}_{7}}\] , the formula of its ferric pyrophosphate will be
A)
\[F{{e}_{2}}{{({{P}_{2}}{{O}_{7}})}_{3}}\] done
clear
B)
\[F{{e}_{4}}({{P}_{4}}{{O}_{14}})\] done
clear
C)
\[F{{e}_{4}}{{({{P}_{2}}{{O}_{7}})}_{3}}\] done
clear
D)
\[F{{e}_{3}}P{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 93)
Which of the following compounds does not dissolve in ammonium hydroxide solution
A)
\[AgF\] done
clear
B)
\[AgBr\] done
clear
C)
\[AgCl\] done
clear
D)
\[AgI\] done
clear
View Solution play_arrow
question_answer 94)
Which of the following is non-stoichiometric
A)
\[F{{e}_{3}}{{O}_{4}}\] done
clear
B)
\[F{{e}_{2}}{{O}_{3}}\] done
clear
C)
\[FeO\] done
clear
D)
All the above done
clear
View Solution play_arrow
question_answer 95)
Ferrosilicon is used in steel industry as [Kerala (Med.) 2003]
A)
A flux done
clear
B)
Scavenger of hydrogen done
clear
C)
A reducing agent done
clear
D)
A cutting tool done
clear
E)
Alloying agent done
clear
View Solution play_arrow
question_answer 96)
In the reaction, \[2KMn{{O}_{4}}+16HCl\to 5C{{l}_{2}}+2MnC{{l}_{2}}+2KCl+8{{H}_{2}}O\] the reduction product is [Kerala (Med.) 2003]
A)
\[C{{l}_{2}}\] done
clear
B)
\[MnC{{l}_{2}}\] done
clear
C)
\[{{H}_{2}}O\] done
clear
D)
\[KCl\] done
clear
View Solution play_arrow
question_answer 97)
Which one of the following statements is correct [AIEEE 2003]
A)
Manganese salts give violet borax bead test in the reducing flame done
clear
B)
From a mixed precipitate of \[AgCl\] and \[AgI\] ammonia solution dissolves only \[AgCl\] done
clear
C)
Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution done
clear
D)
On boiling a solution having \[{{K}^{+}},\,C{{a}^{2+}}\] and \[HCO_{3}^{-}\] ions we get a precipitate of \[{{K}_{2}}Ca{{(C{{O}_{3}})}_{2}}\] done
clear
View Solution play_arrow
question_answer 98)
Collin's reagent is [RPMT 2002]
A)
\[MN{{O}_{2}}/HCl\] done
clear
B)
\[MN{{O}_{4}}/{{C}_{5}}{{H}_{5}}N\] done
clear
C)
\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}/{{H}_{2}}S{{O}_{4}}\] done
clear
D)
\[C{{r}_{2}}{{O}_{3}}/2{{C}_{5}}{{H}_{5}}N\] done
clear
View Solution play_arrow
question_answer 99)
Which compound has coloured aqueous solution [RPMT 2002]
A)
\[Zn{{(N{{O}_{3}})}_{2}}\] done
clear
B)
\[LiN{{O}_{3}}\] done
clear
C)
\[Co{{(N{{O}_{3}})}_{2}}\] done
clear
D)
\[Ba{{(N{{O}_{3}})}_{2}}\] done
clear
View Solution play_arrow
question_answer 100)
Zinc oxide when treated with \[NaOH\] solution gives
A)
\[Zn{{(OH)}_{2}}\] done
clear
B)
\[ZnC{{l}_{2}}\] done
clear
C)
\[N{{a}_{2}}Zn{{O}_{2}}\] done
clear
D)
\[Zn{{(OH)}_{3}}\] done
clear
View Solution play_arrow
question_answer 101)
Which of the following compounds volatilises on heating [BHU 1998]
A)
\[MgC{{l}_{2}}\] done
clear
B)
\[HgC{{l}_{2}}\] done
clear
C)
\[CaC{{l}_{2}}\] done
clear
D)
\[FeC{{l}_{3}}\] done
clear
View Solution play_arrow
question_answer 102)
Which of the following statement is not true
A)
Colourless compounds of transition elements are paramagnetic done
clear
B)
Coloured compounds of transition elements are paramagnetic done
clear
C)
Colourless compounds of transition elements are diamagnetic done
clear
D)
Transition elements form the complex compounds done
clear
View Solution play_arrow
question_answer 103)
Calamine is a mineral, which is [MP PMT 2003]
A)
\[ZnC{{O}_{3}}\] done
clear
B)
\[ZnS\] done
clear
C)
\[ZnS{{O}_{4}}\] done
clear
D)
\[ZnO\] done
clear
View Solution play_arrow
question_answer 104)
Super conductors are derived from compounds of [Kerala (Engg.) 2002]
A)
p-block elements done
clear
B)
Lanthanides done
clear
C)
Actinides done
clear
D)
Transition elements done
clear
View Solution play_arrow
question_answer 105)
Manganese achieves its highest oxidation state in its compound [MP PET 1993, 2001; MP PMT 2004]
A)
\[Mn{{O}_{3}}\] done
clear
B)
\[M{{n}_{3}}{{O}_{4}}\] done
clear
C)
\[KMn{{O}_{4}}\] done
clear
D)
\[{{K}_{2}}Mn{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 106)
Which can be reduced to the metal by heating it in a stream of hydrogen [DPMT 2000]
A)
Copper (II) oxide done
clear
B)
Magnesium oxide done
clear
C)
Aluminium oxide done
clear
D)
Calcium oxide done
clear
View Solution play_arrow
question_answer 107)
Which of the following is coloured
A)
\[ScC{{l}_{3}}\] done
clear
B)
\[Ti{{O}_{2}}\] done
clear
C)
\[MnS{{O}_{4}}\] done
clear
D)
\[ZnS{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 108)
Chrome green is
A)
Chromium sulphate done
clear
B)
Chromium chloride done
clear
C)
Chromium nitrate done
clear
D)
Chromium oxide done
clear
View Solution play_arrow
question_answer 109)
The colour of \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}Fe{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] is [BHU 1982; CPMT 1989]
A)
White done
clear
B)
Green done
clear
C)
Violet done
clear
D)
Blue done
clear
View Solution play_arrow
question_answer 110)
Correct formula of potassium ferricyanide is [DPMT 1982, 83; CPMT 1974; AFMC 2005]
A)
\[{{K}_{4}}Fe{{(CN)}_{6}}\] done
clear
B)
\[{{K}_{3}}Fe{{(CN)}_{6}}\] done
clear
C)
\[{{K}_{3}}[Fe{{(CN)}_{3}}]\] done
clear
D)
\[{{K}_{3}}[Fe{{(CN)}_{4}}]\] done
clear
View Solution play_arrow
question_answer 111)
The form of iron having the highest carbon content is [DPMT 2005]
A)
Cast iron done
clear
B)
Wrought iron done
clear
C)
Strain steel done
clear
D)
Mild steel done
clear
View Solution play_arrow
question_answer 112)
Aqueous solution of ferric chloride is [MP PMT 1999]
A)
Acidic done
clear
B)
Basic done
clear
C)
Neutral done
clear
D)
Amphoteric done
clear
View Solution play_arrow
question_answer 113)
In the reduction of dichromate by \[Fe(II)\]the number of electrons involved per chromium atom is [Pb. PMT 2001]
A)
2 done
clear
B)
3 done
clear
C)
4 done
clear
D)
1 done
clear
View Solution play_arrow
question_answer 114)
A group of acidic oxide is [MP PET 2003]
A)
\[Cr{{O}_{3}},\,\,M{{n}_{2}}{{O}_{7}}\] done
clear
B)
\[ZnO,\,\,A{{l}_{2}}{{O}_{3}}\] done
clear
C)
\[CaO,\,\,ZnO\] done
clear
D)
\[N{{a}_{2}}O,\,\,A{{l}_{2}}{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 115)
Silver nitrate is mainly used [CPMT 1988, 93]
A)
In photography done
clear
B)
In model formation done
clear
C)
As reducing agent done
clear
D)
As dehydrating agent done
clear
View Solution play_arrow
question_answer 116)
The correct order of magnetic moments (spin only values in B.M.) among is [AIEEE 2004]
A)
\[{{[Fe{{(CN)}_{6}}]}^{4-}}>{{[MnC{{l}_{4}}]}^{2-}}>{{[CoC{{l}_{4}}]}^{2-}}\] done
clear
B)
\[{{[MnC{{l}_{4}}]}^{2-}}>{{[Fe{{(CN)}_{6}}]}^{4-}}>{{[CoC{{l}_{4}}]}^{2-}}\] done
clear
C)
\[{{[MnC{{l}_{4}}]}^{2-}}>{{[CoC{{l}_{4}}]}^{2-}}>{{[Fe{{(CN)}_{6}}]}^{4-}}\] done
clear
D)
\[{{[Fe{{(CN)}_{6}}]}^{4-}}>{{[CoC{{l}_{4}}]}^{2-}}>{{[MnC{{l}_{4}}]}^{2-}}\] (Atomic nos. \[Mn=25,\,Fe=26,\,Co=27\]) done
clear
View Solution play_arrow
question_answer 117)
Hybridization of \[[Ni{{(CO)}_{4}}]\] is [Pb. CET 2000]
A)
\[s{{p}^{3}}\] done
clear
B)
\[{{d}^{2}}s{{p}^{3}}\] done
clear
C)
\[s{{p}^{3}}d\] done
clear
D)
\[s{{p}^{2}}\] done
clear
View Solution play_arrow
question_answer 118)
What is the oxidation number of iron in the compound \[[Fe{{({{H}_{2}}O)}_{5}}(NO)]S{{O}_{4}}\] [Pb. CET 2001]
A)
\[+2\] done
clear
B)
\[+3\] done
clear
C)
\[\pm 1\] done
clear
D)
\[\pm 4\] done
clear
View Solution play_arrow
question_answer 119)
Which of the following metal gives hydrogen gas, when heated with hot concentrated alkali [Pb. CET 2002]
A)
Cu done
clear
B)
Ag done
clear
C)
Zn done
clear
D)
Ni done
clear
View Solution play_arrow
question_answer 120)
When ferric oxide reacts with NaOH, the product formed is [Pb. CET 2002]
A)
NaF done
clear
B)
\[FeC{{l}_{3}}\] done
clear
C)
\[Fe{{(OH)}_{3}}\] done
clear
D)
\[NaFe{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 121)
The compound insoluble in water is [AIIMS 2004]
A)
Mercurous nitrate done
clear
B)
Mercuric nitrate done
clear
C)
Mercurous chloride done
clear
D)
Mercurous perchlorate done
clear
View Solution play_arrow
question_answer 122)
Which is an amphoteric oxide [JEE Orissa 2004, 05]
A)
ZnO done
clear
B)
CaO done
clear
C)
BaO done
clear
D)
SrO done
clear
View Solution play_arrow
question_answer 123)
What is the magnetic moment of \[{{[Fe{{F}_{6}}]}^{3-}}\] [JEE Orissa 2004]
A)
5.92 done
clear
B)
5.49 done
clear
C)
2.32 done
clear
D)
4 done
clear
View Solution play_arrow
question_answer 124)
How \[{{H}_{2}}S\] is liberated in laboratory [JEE Orissa 2004]
A)
\[FeS{{O}_{4}}+{{H}_{2}}S{{O}_{4}}\] done
clear
B)
\[FeS+dil.\ {{H}_{2}}S{{O}_{4}}\] done
clear
C)
\[FeS+\text{conc}\text{. }{{H}_{2}}S{{O}_{4}}\] done
clear
D)
Elementary \[{{H}_{2}}\]+ elementary S done
clear
View Solution play_arrow
question_answer 125)
The spin magnetic moment of cobalt in the compound \[Hg[Co{{(SCN)}_{4}}]\] is [IIT JEE Screening 2004]
A)
\[\sqrt{3}\] done
clear
B)
\[\sqrt{8}\] done
clear
C)
\[\sqrt{15}\] done
clear
D)
\[\sqrt{24}\] done
clear
View Solution play_arrow
question_answer 126)
In which of these processes platinum is used as a catalyst [DCE 2004]
A)
Oxidation of ammonia to form \[HN{{O}_{3}}\] done
clear
B)
Hardening of oils done
clear
C)
Production of synthetic rubber done
clear
D)
Synthesis of methanol done
clear
View Solution play_arrow
question_answer 127)
Iron is dropped in dil. \[HN{{O}_{3}}\], it gives [DCE 2004]
A)
Ferric nitrate done
clear
B)
Ferric nitrate and \[N{{O}_{2}}\] done
clear
C)
Ferrous nitrate and ammonium nitrate done
clear
D)
Ferrous nitrate and nitric oxide done
clear
View Solution play_arrow
question_answer 128)
\[Cr{{O}_{3}}\] dissolves in aqueous \[NaOH\] to give [J & K 2005]
A)
\[CrO_{4}^{2-}\] done
clear
B)
\[Cr(OH)_{3}^{-}\] done
clear
C)
\[C{{r}_{2}}O_{7}^{2-}\] done
clear
D)
\[Cr{{(OH)}_{2}}\] done
clear
View Solution play_arrow
question_answer 129)
KI and \[CuS{{O}_{4}}\] solution when mixed, give [CPMT 2004; UPSEAT 2004]
A)
\[Cu{{I}_{2}}+{{K}_{2}}S{{O}_{4}}\] done
clear
B)
\[C{{u}_{2}}{{I}_{2}}+{{K}_{2}}S{{O}_{4}}\] done
clear
C)
\[{{K}_{2}}S{{O}_{4}}+C{{u}_{2}}{{I}_{2}}+{{I}_{2}}\] done
clear
D)
\[{{K}_{2}}S{{O}_{4}}+Cu{{I}_{2}}+{{I}_{2}}\] done
clear
View Solution play_arrow
question_answer 130)
When Cu reacts with \[AgN{{O}_{3}}\] solution, the reaction takes place is [CPMT 2004]
A)
Oxidation of Cu done
clear
B)
Reduction of Cu done
clear
C)
Oxidation of Ag done
clear
D)
Reduction of \[NO_{3}^{-}\] done
clear
View Solution play_arrow
question_answer 131)
By annealing, steel [BHU 2004]
A)
Becomes soft done
clear
B)
Becomes liquid done
clear
C)
Becomes hard and brittle done
clear
D)
Is covered with a thin film of \[F{{e}_{3}}{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 132)
Which of the following is more soluble in ammonia [MH CET 2003]
A)
AgCl done
clear
B)
AgBr done
clear
C)
Agl done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 133)
Potassium permagnate works as oxidising agent both in acidic and basic medium. In both state product obtained by \[KMn{{O}_{4}}\] is respestively [Kerala CET 2005]
A)
\[MnO_{2}^{-}\] and \[M{{n}^{3+}}\] done
clear
B)
\[M{{n}^{3+}}\] and \[M{{n}^{2+}}\] done
clear
C)
\[M{{n}^{2+}}\] and \[M{{n}^{3+}}\] done
clear
D)
\[Mn{{O}_{2}}\] and \[M{{n}^{2+}}\] done
clear
E)
\[M{{n}^{2+}}\] and \[Mn{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 134)
Which of the followign is the green coloured powder produced when ammonium dichromate is used in fire works [J & K 2005]
A)
\[Cr\] done
clear
B)
\[Cr{{O}_{3}}\] done
clear
C)
\[C{{r}_{2}}{{O}_{3}}\] done
clear
D)
\[CrO({{O}_{2}})\] done
clear
View Solution play_arrow
question_answer 135)
Which compound does not dissolve in hot dilute \[HN{{O}_{3}}\] [DCE 2002; NCERT 1977]
A)
\[HgS\] done
clear
B)
\[CuS\] done
clear
C)
\[PbS\] done
clear
D)
\[CdS\] done
clear
View Solution play_arrow
question_answer 136)
The least stable oxide at room temperature is [DCE 2002]
A)
ZnO done
clear
B)
CuO done
clear
C)
\[S{{b}_{2}}{{O}_{3}}\] done
clear
D)
\[A{{g}_{2}}O\] done
clear
View Solution play_arrow
question_answer 137)
Which of the following pair of elements cannot form an alloy [KCET 2005]
A)
\[Zn-Cu\] done
clear
B)
\[Fe-Hg\] done
clear
C)
\[Fe,\,C\] done
clear
D)
\[Na,\,Hg\] done
clear
View Solution play_arrow
question_answer 138)
Which of the following shows dimerisation [DCE 2002]
A)
\[HgC{{l}_{2}}\] done
clear
B)
\[{{B}_{2}}{{H}_{6}}\] done
clear
C)
\[TiC{{l}_{4}}\] done
clear
D)
\[S{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 139)
Which of the following is also known as 'Fools gold' [DCE 2003]
A)
Wurtzite done
clear
B)
Iron pyrites done
clear
C)
Chalcosite done
clear
D)
Silver glance done
clear
View Solution play_arrow
question_answer 140)
Which one of the following is highest melting halide [DCE 2003]
A)
AgCl done
clear
B)
AgBr done
clear
C)
AgF done
clear
D)
Agl done
clear
View Solution play_arrow
question_answer 141)
\[4{{K}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{\text{heat}}4{{K}_{2}}Cr{{O}_{4}}+3{{O}_{2}}+X\]. In the above reaction X is [DCE 2004]
A)
\[Cr{{O}_{3}}\] done
clear
B)
\[C{{r}_{2}}{{O}_{7}}\] done
clear
C)
\[C{{r}_{2}}{{O}_{3}}\] done
clear
D)
\[Cr{{O}_{5}}\] done
clear
View Solution play_arrow
question_answer 142)
Monds process is used for [AFMC 2004]
A)
Ni done
clear
B)
Al done
clear
C)
Fe done
clear
D)
Cu done
clear
View Solution play_arrow
question_answer 143)
Stainless steel is an alloy of [AFMC 2004]
A)
Copper done
clear
B)
Nickel and chromium done
clear
C)
Manganese done
clear
D)
Zinc done
clear
View Solution play_arrow
question_answer 144)
Percentage of silver in German silver is [AFMC 2004; CPMT 1985; CBSE PMT 2000; MP PMT 2001]
A)
0% done
clear
B)
1% done
clear
C)
5% done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 145)
Which process of purification is represented by the following scheme\[\underset{\text{impure}}{\mathop{Ti}}\,+2{{I}_{2}}\xrightarrow{{{250}^{o}}C}Ti{{I}_{4}}\xrightarrow{{{1400}^{o}}C}\underset{\text{pure}}{\mathop{Ti}}\,+{{I}_{2}}\] [Kerala PMT 2004]
A)
Cupellation done
clear
B)
Poling done
clear
C)
Electrolytic refining done
clear
D)
Zone refining done
clear
E)
Van-Arkel process done
clear
View Solution play_arrow
question_answer 146)
Which of the following sulphides when heated strongly in air gives the corresponding metal [Kerala PMT 2004]
A)
\[C{{u}_{2}}S\] done
clear
B)
\[CuS\] done
clear
C)
\[F{{e}_{2}}{{S}_{3}}\] done
clear
D)
FeS done
clear
E)
HgS done
clear
View Solution play_arrow
question_answer 147)
Guignet?s green is known as [Kerala PMT 2004]
A)
\[C{{r}_{2}}{{O}_{3}}.\ 2{{H}_{2}}O\] done
clear
B)
\[Fe{{O}_{3}}.2{{H}_{2}}O\] done
clear
C)
\[C{{u}_{2}}{{O}_{3}}\] done
clear
D)
\[FeC{{O}_{3}}.C{{r}_{2}}{{O}_{3}}\] done
clear
E)
\[FeO\ .\ C{{r}_{2}}{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 148)
Vanadium (III) oxide is a strong [Kerala PMT 2004]
A)
Drying agent done
clear
B)
Oxidising agent done
clear
C)
Reducing agent done
clear
D)
Wetting agent done
clear
E)
Precipitating agent done
clear
View Solution play_arrow
question_answer 149)
Stainless steel does not rust because [KCET 2004]
A)
Chromium and nickel combine with iron done
clear
B)
Chromium forms an oxide layer and protects iron from rusting done
clear
C)
Nickel present in it, does not rust done
clear
D)
Iron forms a hard chemical compound with chromium present in it. done
clear
View Solution play_arrow
question_answer 150)
The main product obtained when a solution of sodium carbonate reacts with mercuric chloride is [KCET 2004]
A)
\[Hg{{(OH)}_{2}}\] done
clear
B)
\[HgC{{O}_{3}}.HgO\] done
clear
C)
\[HgC{{O}_{3}}\] done
clear
D)
\[HgC{{O}_{3}}.Hg{{(OH)}_{2}}\] done
clear
View Solution play_arrow
question_answer 151)
Which of the following has diamagnetic character [Pb. CET 2003]
A)
\[{{[NiC{{l}_{4}}]}^{2-}}\] done
clear
B)
\[{{[Co{{F}_{6}}]}^{3-}}\] done
clear
C)
\[{{[Fe{{({{H}_{2}}O)}_{6}}]}^{2+}}\] done
clear
D)
\[{{[Ni{{(CN)}_{4}}]}^{2-}}\] done
clear
View Solution play_arrow
question_answer 152)
The solubility of silver bromide in hypo solution due to the formation of [Pb. CET 2003; CPMT 1987]
A)
\[{{[Ag({{S}_{2}}{{O}_{3}})]}^{-3}}\] done
clear
B)
\[A{{g}_{2}}S{{O}_{3}}\] done
clear
C)
\[{{[Ag({{S}_{2}}{{O}_{3}})]}^{-}}\] done
clear
D)
\[A{{g}_{2}}{{S}_{2}}{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 153)
Brass is an alloy of [DPMT 1982, 83; CPMT 1972, 80, 89; MLNR 1985; AFMC 1990; Pb. CET 2004; EAMCET 1993; MP PMT 1996; KCET 2000]
A)
Zn and Sn done
clear
B)
Zn and Cu done
clear
C)
Cu, Zn and Sn done
clear
D)
Cu and Sn done
clear
View Solution play_arrow
question_answer 154)
Iodine is formed when KI reacts with a solution of [Pb. CET 2004]
A)
\[CuS{{O}_{4}}\] done
clear
B)
\[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] done
clear
C)
\[ZnS{{O}_{4}}\] done
clear
D)
\[FeS{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 155)
Rust is [Pb. CET 2004]
A)
\[FeO+Fe{{(OH)}_{2}}\] done
clear
B)
\[F{{e}_{2}}{{O}_{3}}\] done
clear
C)
\[F{{e}_{2}}{{O}_{3}}+Fe{{(OH)}_{2}}\] done
clear
D)
\[F{{e}_{2}}{{O}_{3}}\] and \[Fe{{(OH)}_{3}}\] done
clear
View Solution play_arrow
question_answer 156)
\[{{[Sc{{({{H}_{2}}O)}_{6}}]}^{3+}}\] ion is [Pb. CET 2004]
A)
Colourless and diamagnetic done
clear
B)
Coloured and octahedral done
clear
C)
Colourless and paramagnetic done
clear
D)
Coloured and paramagnetic done
clear
View Solution play_arrow
question_answer 157)
Which of the following is called white vitriol [MP PET 1990; Bihar MEE 1995; BVP 2004]
A)
\[ZnC{{l}_{2}}\] done
clear
B)
\[MgS{{O}_{4}}.7{{H}_{2}}O\] done
clear
C)
\[ZnS{{O}_{4}}.7{{H}_{2}}O\] done
clear
D)
\[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] done
clear
View Solution play_arrow
question_answer 158)
\[FeS{{O}_{4}}.7{{H}_{2}}O\] shows isomorphism with [BVP 2004]
A)
\[ZnS{{O}_{4}}.7{{H}_{2}}O\] done
clear
B)
\[MnS{{O}_{4}}.4{{H}_{2}}O\] done
clear
C)
\[CaS{{O}_{4}}.5{{H}_{2}}O\] done
clear
D)
\[CaC{{l}_{2}}.2{{H}_{2}}O\] done
clear
View Solution play_arrow
question_answer 159)
Which pair of compound is expected to show similar colour in aqueous medium [IIT Screening 2005]
A)
\[FeC{{l}_{2}}\] and \[CuC{{l}_{2}}\] done
clear
B)
\[VOC{{l}_{2}}\,\text{and }CuC{{l}_{2}}\] done
clear
C)
\[VOC{{l}_{2}}\text{ and }FeC{{l}_{2}}\] done
clear
D)
\[FeC{{l}_{2}}\text{ and }MnC{{l}_{2}}\] done
clear
View Solution play_arrow
question_answer 160)
Which of the following dissolves in hot conc. NaOH solution [CPMT 2004]
A)
Fe done
clear
B)
Zn done
clear
C)
Sn done
clear
D)
Ag done
clear
View Solution play_arrow
question_answer 161)
Which of the following sulphides is yellow in colour [CPMT 1983, 88, 2004; NCERT 1976]
A)
CuS done
clear
B)
CdS done
clear
C)
ZnS done
clear
D)
CoS done
clear
View Solution play_arrow
question_answer 162)
Which of the following is not oxidized by \[{{O}_{3}}\] [IIT Screening 2005]
A)
KI done
clear
B)
\[FeS{{O}_{4}}\] done
clear
C)
\[KMn{{O}_{4}}\] done
clear
D)
\[{{K}_{2}}Mn{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 163)
The number of moles of \[KMn{{O}_{4}}\] reduced by one mole of KI in alkaline medium is [CBSE PMT 2005]
A)
One fifth done
clear
B)
Five done
clear
C)
One done
clear
D)
Two done
clear
View Solution play_arrow
question_answer 164)
Excess of KI reacts with \[CuS{{O}_{4}}\] solution and then \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] solution is added to it. Which of the statements is incorrect for this reaction [AIEEE 2004]
A)
\[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] is oxidised done
clear
B)
\[Cu{{I}_{2}}\] is formed done
clear
C)
\[C{{u}_{2}}{{I}_{2}}\]is formed done
clear
D)
Evolved \[{{I}_{2}}\] is reduced done
clear
View Solution play_arrow
question_answer 165)
The only cations present in a slightly acidic solution are \[F{{e}^{3+}},\ Z{{n}^{2+}}\] and \[C{{u}^{2+}}\]. The reagent that when added in excess to this solution would identify and separate \[F{{e}^{3+}}\] in one step is [IIT 1997]
A)
2M HCl done
clear
B)
\[6M\ N{{H}_{3}}\] done
clear
C)
\[6M\ NaOH\] done
clear
D)
\[{{H}_{2}}S\] gas done
clear
View Solution play_arrow
question_answer 166)
Which element is alloyed with copper to form bronze [CPMT 1972, 80, 93; CPMT 1980, 82]
A)
Fe done
clear
B)
Mn done
clear
C)
Sn done
clear
D)
Zn done
clear
View Solution play_arrow
question_answer 167)
Emery consists of [AFMC 1999]
A)
Impure corundum done
clear
B)
Impure carborundum done
clear
C)
Impure graphite done
clear
D)
Purest form of iron done
clear
View Solution play_arrow
question_answer 168)
The metal commonly present in brass and german silver is [EAMCET 1988]
A)
Mg done
clear
B)
Zn done
clear
C)
C done
clear
D)
Al done
clear
View Solution play_arrow
question_answer 169)
In the equation \[4M+8C{{N}^{-}}+2{{H}_{2}}O+{{O}_{2}}\xrightarrow{{}}4{{[M(C{{N}_{2}})]}^{-}}+4O{{H}^{-}}\] The metal M is [MP PET 2000]
A)
Copper done
clear
B)
Iron done
clear
C)
Gold done
clear
D)
Zinc done
clear
View Solution play_arrow
question_answer 170)
The term platforming is [Kerala (Med.) 2002]
A)
Platinum painting done
clear
B)
Flat sheet of platinum done
clear
C)
Platinum manufacturing done
clear
D)
Platinum used as a catalyst done
clear
View Solution play_arrow
question_answer 171)
Purple of cassium is [BHU 2002]
A)
Gold solution done
clear
B)
Silver solution done
clear
C)
Copper solution done
clear
D)
Platinum solution done
clear
View Solution play_arrow
question_answer 172)
Match the items under List 1 with the compounds/elements from the List 2. Select the correct answer from the sets a, b, c and d. List 1 List 2 (i) Explosive A) \[Na{{N}_{3}}\] (ii) Artificial gem B) \[F{{e}_{3}}{{O}_{4}}\] (iii) Self reduction C) Sn (iv) Magnetic material D) \[A{{l}_{2}}{{O}_{3}}\] E) \[Pb{{({{N}_{3}})}_{2}}\] F) \[F{{e}_{2}}{{O}_{3}}\] G) Cu H) SiC
A)
(i) A, (ii) D, (iii) G, (iv) B done
clear
B)
(i) A, (ii) D, (iii) G, (iv) F done
clear
C)
(i) E, (ii) D, (iii) G, (iv) B done
clear
D)
(i) E, (ii) H, (iii) C, (iv) F done
clear
View Solution play_arrow
question_answer 173)
Blood haemoglobin contains the metal
A)
Al done
clear
B)
Mg done
clear
C)
Cu done
clear
D)
Fe done
clear
View Solution play_arrow
question_answer 174)
Percentage of carbon in steel is
A)
2.5 - 4.5% done
clear
B)
0.25 - 0.5% done
clear
C)
0.2 - 1.5% done
clear
D)
3 - 3.5% done
clear
View Solution play_arrow
question_answer 175)
Steel is manufactured from
A)
Wrought iron done
clear
B)
Cast iron done
clear
C)
A and B both done
clear
D)
Haematite done
clear
View Solution play_arrow
question_answer 176)
Modern method for the manufacture of steel is
A)
Bessemer process done
clear
B)
Seimen-Martin's open hearth process done
clear
C)
Duplex method done
clear
D)
L.D. process done
clear
View Solution play_arrow
question_answer 177)
Spiegeleisen is an alloy of
A)
Fe, C and Mn done
clear
B)
Fe, Mg and C done
clear
C)
Fe, Co and Cr done
clear
D)
Fe, Cu and Ni done
clear
View Solution play_arrow
question_answer 178)
Stainless steel is an alloy steel of the following metals [MP PET 1990; Pb. PET 1999; KCET 2000]
A)
\[Fe\] Only done
clear
B)
Cr and Ni done
clear
C)
W and Cr done
clear
D)
Ni and Be done
clear
View Solution play_arrow
question_answer 179)
In the manufacture of steel, the Bessemer converter is containing lining of
A)
\[Si{{O}_{2}}\] done
clear
B)
\[CaO\] done
clear
C)
\[CaO\] and \[MgO\] done
clear
D)
\[F{{e}_{2}}{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 180)
Which of the following alloys contain only Cu and Zn [DCE 1999]
A)
Bronze done
clear
B)
Brass done
clear
C)
Gun metal done
clear
D)
Bell metal done
clear
View Solution play_arrow
question_answer 181)
Steel becomes soft and pliable by [MP PET 1989]
A)
Annealing done
clear
B)
Nitriding done
clear
C)
Tempering done
clear
D)
Case hardening done
clear
View Solution play_arrow
question_answer 182)
Most stable oxidation state of iron is [AFMC 1976; CPMT 1988]
A)
\[+2\] done
clear
B)
\[+3\] done
clear
C)
\[-2\] done
clear
D)
\[-3\] done
clear
View Solution play_arrow
question_answer 183)
Nickel steel contain % of Ni [MP PMT/PET 1988]
A)
\[1-5%\] done
clear
B)
\[3-5%\] done
clear
C)
\[6-5%\] done
clear
D)
\[8-5%\] done
clear
View Solution play_arrow
question_answer 184)
Permanent magnet is made from [MP PET/PMT 1988; CBSE 1989]
A)
Cast iron done
clear
B)
Steel done
clear
C)
Wrought Iron done
clear
D)
All of these done
clear
View Solution play_arrow
question_answer 185)
In nitriding process of steel [MP PET/PMT 1988; CBSE 1989]
A)
Steel is heated in an atmosphere of ammonia done
clear
B)
Steel is made red hot and then cooled done
clear
C)
Steel is made red hot and then plunged into oil for cooling done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 186)
Iron on reacting with carbon give
A)
FeC done
clear
B)
\[F{{e}_{2}}C\] done
clear
C)
\[F{{e}_{3}}C\] done
clear
D)
\[Fe{{C}_{2}}\] done
clear
View Solution play_arrow
question_answer 187)
Iron loses magnetic property at [KCET 2002]
A)
Melting point done
clear
B)
1000K done
clear
C)
Curie point done
clear
D)
Boiling point done
clear
View Solution play_arrow
question_answer 188)
Heat treatment alters the properties of steel due to [KCET 2002]
A)
Chemical reaction on heating done
clear
B)
Partial rusting done
clear
C)
Change in the residual energy done
clear
D)
Change in the lattice structure due to differential rate of cooling done
clear
View Solution play_arrow
question_answer 189)
Pure conc. \[HN{{O}_{3}}\]makes iron passive as the surface is covered with protective layer of [Orrisa JEE 2002; EAMCET 1993]
A)
\[F{{e}_{2}}{{O}_{3}}\] done
clear
B)
FeO done
clear
C)
\[F{{e}_{3}}{{O}_{4}}\] done
clear
D)
\[Fe{{(N{{O}_{3}})}_{3}}\] done
clear
View Solution play_arrow
question_answer 190)
Red hot iron absorbs \[S{{O}_{2}}\] giving the product [Orrisa JEE 2002]
A)
\[FeS+{{O}_{2}}\] done
clear
B)
\[F{{e}_{2}}{{O}_{3}}+FeS\] done
clear
C)
\[FeO+FeS\] done
clear
D)
\[FeO+S\] done
clear
View Solution play_arrow
question_answer 191)
If steel is heated to a temperature well below red heat and is then cooled slowly, the process is called [Kerala (Med.) 2002]
A)
Tempering done
clear
B)
Hardening done
clear
C)
Softening done
clear
D)
Annealing done
clear
View Solution play_arrow
question_answer 192)
In smelting of iron, which of the following reactions takes place in Blast furnace at \[{{400}^{o}}C-{{600}^{o}}C\] [MP PET 2002]
A)
\[CaO+Si{{O}_{2}}\to CaSi{{O}_{3}}\] done
clear
B)
\[2FeS+3{{O}_{2}}\to 2Fe+S{{O}_{2}}\] done
clear
C)
\[FeO+Si{{O}_{2}}\to FeSi{{O}_{3}}\] done
clear
D)
\[F{{e}_{2}}{{O}_{3}}+3CO\to 2Fe+3C{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 193)
Soil containing both Al and Fe is called [DPMT 2002]
A)
Laterite done
clear
B)
Bauxite done
clear
C)
Pedalfers done
clear
D)
Clay done
clear
View Solution play_arrow
question_answer 194)
German silver is an alloy of [EAMCET 1979;CPMT 1986, 93; MP PET/PMT 1998; UPSEAT 1999; CBSE PMT 2000; KCET 2000; MP PMT 2001]
A)
Copper, zinc and nickel done
clear
B)
Copper and silver done
clear
C)
Copper, zinc and tin done
clear
D)
Copper, zinc and silver done
clear
View Solution play_arrow
question_answer 195)
Iron is rendered passive by the action of [IIT 1982; MP PET 1985; MP PMT 1987; DPMT 1984; KCET 1993]
A)
Conc. \[{{H}_{2}}S{{O}_{4}}\] done
clear
B)
Conc. \[{{H}_{3}}P{{O}_{4}}\] done
clear
C)
Conc. \[HCl\] done
clear
D)
Conc. \[HN{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 196)
Iron sheets are galvanized by depositing a coating of or In galvanisation, iron surface is coated with [MP PET 1985, 86, 87, 89, 92, 96; NCERT 1980; Bihar CEE 1995]
A)
Zinc done
clear
B)
Tin done
clear
C)
Chromium done
clear
D)
Nickel done
clear
View Solution play_arrow
question_answer 197)
Chemical formula of rust is [BHU 1986; MP PET 1990]
A)
\[FeO\] done
clear
B)
\[F{{e}_{3}}{{O}_{4}}\] done
clear
C)
\[F{{e}_{2}}{{O}_{3}}.x{{H}_{2}}O\] done
clear
D)
\[FeO.\,x{{H}_{2}}O\] done
clear
View Solution play_arrow
question_answer 198)
Heating steel to bright redness and then cooling suddenly by plunging it into oil or water, makes it [MP PET 1990]
A)
Hard and pliable done
clear
B)
Soft and pliable done
clear
C)
Soft and brittle done
clear
D)
Hard and brittle done
clear
View Solution play_arrow
question_answer 199)
Which of the following is found in body [CPMT 1975]
A)
\[Pb\] done
clear
B)
\[Fe\] done
clear
C)
\[Cd\] done
clear
D)
\[Al\] done
clear
View Solution play_arrow
question_answer 200)
Which of the following pairs of elements might form an alloy [NCERT 1981]
A)
Zinc and lead done
clear
B)
Iron and mercury done
clear
C)
Iron and carbon done
clear
D)
Mercury and platinum done
clear
View Solution play_arrow
question_answer 201)
Ferrous sulphate on strong heating gives
A)
\[S{{O}_{2}}\] done
clear
B)
\[F{{e}_{2}}{{(S{{O}_{4}})}_{3}}\] done
clear
C)
\[FeO+S{{O}_{3}}\] done
clear
D)
\[F{{e}_{2}}{{O}_{3}}+S{{O}_{2}}+S{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 202)
Green vitriol is [DPMT 1985; BHU 1997; RPET 1999; JIPMER 2002]
A)
\[CuS{{O}_{4}}.5{{H}_{2}}O\] done
clear
B)
\[FeS{{O}_{4}}.7{{H}_{2}}O\] done
clear
C)
\[CaS{{O}_{4}}.2{{H}_{2}}O\] done
clear
D)
\[ZnS{{O}_{4}}.7{{H}_{2}}O\] done
clear
View Solution play_arrow
question_answer 203)
When conc. sulphuric acid is added slowly to a solution of ferrous sulphate containing nitrate ion, a brown colour ring is formed. The composition of the ring is [CPMT 1989]
A)
\[[Fe{{({{H}_{2}}O)}_{5}}NO]S{{O}_{4}}\] done
clear
B)
\[FeS{{O}_{4}}.N{{O}_{2}}\] done
clear
C)
\[Fe[{{({{H}_{2}}O)}_{5}}]{{(N{{O}_{3}})}_{2}}\] done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 204)
\[{{F}_{2}}\] is the formed by reacting \[{{K}_{2}}Mn{{F}_{6}}\] with [AIIMS 2005]
A)
\[Sb{{F}_{5}}\] done
clear
B)
\[Mn{{F}_{3}}\] done
clear
C)
\[KSb{{F}_{6}}\] done
clear
D)
\[Mn{{F}_{4}}\] done
clear
View Solution play_arrow
question_answer 205)
Railway wagon axles are made by heating rods of iron embedded in charcoal powder. The process is known as [CPMT 1972; DCE 2000; KCET 2003; UPSEAT 2001]
A)
Case hardening done
clear
B)
Sherardizing done
clear
C)
Annealing done
clear
D)
Tempering done
clear
View Solution play_arrow
question_answer 206)
The alloy of steel that is used in making automobile parts and utensils [EAMCET 1979; MP PMT 1992]
A)
Stainless steel done
clear
B)
Nickel steel done
clear
C)
Tungstun steel done
clear
D)
Chromium steel done
clear
View Solution play_arrow
question_answer 207)
Which of the following has lowest percentage of carbon [DPMT 1984; CPMT 1989, 91, 94; KCET 2000]
A)
Cast iron done
clear
B)
Wrought iron done
clear
C)
Steel done
clear
D)
All have same percentage done
clear
View Solution play_arrow
question_answer 208)
Galvanisation is the [CPMT 1980, 86, 91, 99; MP PET/PMT 1988; Pb. PET 1999]
A)
Deposition of \[Zn\] on \[Fe\] done
clear
B)
Deposition of \[Al\] on \[Fe\] done
clear
C)
Deposition of \[Sn\] on \[Fe\] done
clear
D)
Deposition of \[Cu\] on \[Fe\] done
clear
View Solution play_arrow
question_answer 209)
Tempered steel is
A)
Soft and pliable done
clear
B)
Hard and brittle done
clear
C)
Neither so hard nor so brittle done
clear
D)
Very soft done
clear
View Solution play_arrow
question_answer 210)
Best quality of steel is manufactured by [BHU 1996]
A)
Siemen -Martin's open hearth process done
clear
B)
Electrical process done
clear
C)
Bessemer process done
clear
D)
Blast furnace done
clear
View Solution play_arrow
question_answer 211)
The presence of \[Si\] in steel gives it
A)
Fibrous structure done
clear
B)
Silicate type structure done
clear
C)
Sheet type structure done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 212)
The presence of \[Mn\] in steel produces
A)
Elasticity done
clear
B)
Increases tensile strength done
clear
C)
Both a and b done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 213)
Presence of \[Cr\] in steel makes it
A)
Resistant to chemical action done
clear
B)
Useful for making cutlery done
clear
C)
Increases chemical action done
clear
D)
a and b both done
clear
View Solution play_arrow
question_answer 214)
The addition of metals like \[Cr,\,Mn,\,W\] and \[Ni\] to ordinary steel makes it
A)
More useful done
clear
B)
Alters the properties of ordinary steel done
clear
C)
Both a and b done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 215)
Stainless steel is non-corrosive. This character is more prominent in
A)
\[Mn\] steel done
clear
B)
Ordinary steel done
clear
C)
\[Ti\] steel done
clear
D)
All of these done
clear
View Solution play_arrow
question_answer 216)
When little vanadium is mixed with steel, it becomes
A)
More hard done
clear
B)
More tensility done
clear
C)
Both a and b done
clear
D)
No effect done
clear
View Solution play_arrow
question_answer 217)
To obtain steel entirely free from sulphur and phosphorus, the process used is
A)
Electrothermal process done
clear
B)
Bessemer process done
clear
C)
Open-hearth process done
clear
D)
Duplex process done
clear
View Solution play_arrow
question_answer 218)
Stainless steel contains ........... \[Cr\]
A)
14% done
clear
B)
5% done
clear
C)
50% done
clear
D)
2.5% done
clear
View Solution play_arrow
question_answer 219)
The chief constituents of steel made in India are [MP PMT/PET 1988]
A)
\[Mn\] and \[Cr\] done
clear
B)
\[Al\] and \[Zn\] done
clear
C)
\[V\] and \[Co\] done
clear
D)
\[Ni\] and \[Mg\] done
clear
View Solution play_arrow
question_answer 220)
Which of the following is used to prepare medical instruments
A)
Cast iron done
clear
B)
Wrought iron done
clear
C)
Steel done
clear
D)
Alloy of \[Cu\] and \[Fe\] done
clear
View Solution play_arrow
question_answer 221)
A clock spring is heated to redness and then plunged into cold water. This treatment will cause it to become [NCERT 1979]
A)
Soft and ductile done
clear
B)
More springy than before done
clear
C)
Strongly magnetic done
clear
D)
Hard and brittle done
clear
View Solution play_arrow
question_answer 222)
Mark the steel in which carbon % is highest
A)
Mild steel done
clear
B)
Hard steel done
clear
C)
Alloy steel done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 223)
Mark the variety of iron which has highest melting point
A)
Pig iron done
clear
B)
Cast iron done
clear
C)
Wrought iron done
clear
D)
Steel done
clear
View Solution play_arrow
question_answer 224)
Bessemer converter is used in the manufacture of [CPMT 1991]
A)
Pig iron done
clear
B)
Steel done
clear
C)
Wrought iron done
clear
D)
Cast iron done
clear
View Solution play_arrow
question_answer 225)
Steel contains [MP PMT 1989; KCET 2000]
A)
\[Fe+C+Mn\] done
clear
B)
\[Fe+C+Al\] done
clear
C)
\[Fe+Mn\] done
clear
D)
\[Fe+Mn+Cr\] done
clear
View Solution play_arrow
question_answer 226)
Steel differs from pig iron and wrought iron in that it contains [KCET 1991]
A)
No carbon at all done
clear
B)
Less carbon than either done
clear
C)
More carbon than either done
clear
D)
An amount of carbon intermediate between two done
clear
View Solution play_arrow
question_answer 227)
Finely divided iron combines with \[CO\] to give [MNR 1994]
A)
\[Fe{{(CO)}_{5}}\] done
clear
B)
\[F{{e}_{2}}{{(CO)}_{9}}\] done
clear
C)
\[F{{e}_{3}}{{(CO)}_{12}}\] done
clear
D)
\[Fe{{(CO)}_{6}}\] done
clear
View Solution play_arrow
question_answer 228)
Mohr's salt is [KCET 1993;DCE 1999; AIIMS 2000]
A)
\[FeS{{O}_{4}}.7{{H}_{2}}O\] done
clear
B)
\[Fe(N{{H}_{4}})S{{O}_{4}}.6{{H}_{2}}O\] done
clear
C)
\[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.FeS{{O}_{4}}.6{{H}_{2}}O\] done
clear
D)
\[[Fe{{(N{{H}_{4}})}_{2}}]\,{{(S{{O}_{4}})}_{2}}.6{{H}_{2}}O\] done
clear
View Solution play_arrow
question_answer 229)
Mohr's salt is [MNR 1986]
A)
Normal salt done
clear
B)
Acid salt done
clear
C)
Basic salt done
clear
D)
Double salt done
clear
View Solution play_arrow
question_answer 230)
An example of double salt is [CPMT 1986; CBSE PMT 1989; Roorkee 1990]
A)
Bleaching powder done
clear
B)
\[{{K}_{4}}[Fe{{(CN)}_{6}}]\] done
clear
C)
Hypo done
clear
D)
Potash alum done
clear
View Solution play_arrow
question_answer 231)
The passivity of iron in concentrated nitric acid is due to [MP PMT 1994]
A)
Ferric nitrate coating on the metal done
clear
B)
Ammonium nitrate coating on the metal done
clear
C)
A thin oxide layer coating on the metal done
clear
D)
A hydride coating on the metal done
clear
View Solution play_arrow
question_answer 232)
The action of steam on heated iron is represented as [MP PMT 1994]
A)
\[3Fe+4{{H}_{2}}O\to F{{e}_{3}}{{O}_{4}}+4{{H}_{2}}\] done
clear
B)
\[2Fe+3{{H}_{2}}O\to F{{e}_{2}}{{O}_{3}}+3{{H}_{2}}\] done
clear
C)
\[Fe+{{H}_{2}}O\to FeO+{{H}_{2}}\] done
clear
D)
\[2Fe+{{H}_{2}}O+{{O}_{2}}\to F{{e}_{2}}{{O}_{3}}+{{H}_{2}}\] done
clear
View Solution play_arrow
question_answer 233)
Which metal is used to make alloy steel for armour plates, safes and helmets [KCET 2003]
A)
Al done
clear
B)
Mn done
clear
C)
Cr done
clear
D)
Pb done
clear
View Solution play_arrow
question_answer 234)
Rusting on iron needs [MP PMT 1995]
A)
Dry air done
clear
B)
Air and water done
clear
C)
Distilled water and carbon dioxide done
clear
D)
Oxygen and carbon dioxide done
clear
View Solution play_arrow
question_answer 235)
Iron when treated with concentrated nitric acid [MP PET 1996]
A)
Readily reacts done
clear
B)
Slowly reacts done
clear
C)
Becomes passive done
clear
D)
Gives ferrous nitrate done
clear
View Solution play_arrow
question_answer 236)
An alloy which does not contain copper is [DPMT 1984]
A)
Solder done
clear
B)
Bronze done
clear
C)
Brass done
clear
D)
Bell metal done
clear
View Solution play_arrow
question_answer 237)
Which one of the following statements shows the correct percentage of carbon in steel, pig iron and wrought iron
A)
Steel containing less than 0.15% carbon; wrought iron 0.15 to 2.0% carbon; and pig iron over 2% carbon done
clear
B)
Pig iron less than 0.15% carbon; wrought iron 0.15 to 2.0% carbon; and steel over 2% carbon done
clear
C)
Wrought iron less than 0.15% carbon; steel 0.15 to 2.0% carbon; and pig iron over 2% carbon done
clear
D)
Wrought iron less than 0.15% carbon; pig iron 0.15 to 2.0% carbon; and steel over 2.0% carbon done
clear
View Solution play_arrow
question_answer 238)
In the Bessemer and open-hearth process for the manufacture of steel, which one of the following is used for the removal of carbon in part or whole
A)
Bessemer-Ferric Open-oxide hearth-Air done
clear
B)
Bessemer-Air Open-Ferric hearth-oxide done
clear
C)
Bessemer-Oxygen Open-Scrap hearth-iron done
clear
D)
Bessemer-Air Open-Scrap hearth-iron done
clear
View Solution play_arrow
question_answer 239)
About the basic open hearth process, which statement is wrong
A)
Limestone is added to the charge done
clear
B)
Phosphorus impurity cannot be removed by this process done
clear
C)
Carbon content of the steel can be uniformly controlled over a series of batches done
clear
D)
Iron scrap can be utilized done
clear
View Solution play_arrow
question_answer 240)
Which of the following statements is wrong
A)
Heating to a high temperature and then cooling suddenly, e.g. by dipping in water, makes steel hard and brittle done
clear
B)
Steel can be softened by heating it to a high temperature for a prolonged time and then cooling slowly. This is called quenching. done
clear
C)
Tempering of hardened steel is done by heating it to just below red heat at controlled temperature and duration done
clear
D)
Phosphorus impurity makes steel ?cold short? done
clear
View Solution play_arrow
question_answer 241)
Bell metal is an alloy of [DPMT 1990, 96; CBSE PMT 1999; Kerala PMT 2002]
A)
\[Cu,\,Zn\] and \[Sn\] done
clear
B)
\[Cu,\,Zn\] and \[Ni\] done
clear
C)
\[Cu\] and \[Zn\] done
clear
D)
\[Cu\] and \[Sn\] done
clear
View Solution play_arrow
question_answer 242)
Turnbull's blue is [Bihar CEE 1995]
A)
Ferricyanide done
clear
B)
Ferrous ferricyanide done
clear
C)
Ferrous cyanide done
clear
D)
Ferri-ferrocyanide done
clear
View Solution play_arrow
question_answer 243)
Addition of high proportions of manganese makes steel useful in making rails of rail-roads because manganese [IIT 1998]
A)
Gives hardness to steel done
clear
B)
Helps the formation of oxides of iron done
clear
C)
Can remove oxygen and sulphur done
clear
D)
Can show highest oxidation state of +7 done
clear
View Solution play_arrow
question_answer 244)
Copper displaces which of the metal from their salt solutions [CPMT 1988]
A)
\[AgN{{O}_{3}}\] done
clear
B)
\[ZnS{{O}_{4}}\] done
clear
C)
\[FeS{{O}_{4}}\] done
clear
D)
All of these done
clear
View Solution play_arrow
question_answer 245)
Which of the following statement(s) is(are) correct with reference to the ferrous and ferric ions [IIT 1998]
A)
\[F{{e}^{3+}}\] gives brown colour with potassium ferricyanide done
clear
B)
\[F{{e}^{2+}}\]gives blue precipitate with potassium ferricyanide done
clear
C)
\[F{{e}^{3+}}\] gives red colour with potassium thiocyanate done
clear
D)
\[F{{e}^{2+}}\] gives brown colour with ammonium thiocyanate done
clear
View Solution play_arrow
question_answer 246)
Which of the following element constitutes a major impurity in pig iron [CBSE PMT 1998]
A)
Silicon done
clear
B)
Oxygen done
clear
C)
Sulphur done
clear
D)
Graphite done
clear
View Solution play_arrow
question_answer 247)
Annealing is [Pune CET 1998; AFMC 2002]
A)
Heating steel in nitrogen and cooling done
clear
B)
Heating steel to bright redness and then cooling slowly done
clear
C)
Heating wrought iron with carbon to redness done
clear
D)
Heating steel to high temperature and cooling suddenly by plunging in water done
clear
View Solution play_arrow
question_answer 248)
In electroplating, the metal that is not used for plating is [Pune CET 1998]
A)
\[Fe\] done
clear
B)
\[Zn\] done
clear
C)
\[Ni\] done
clear
D)
\[Au\] done
clear
View Solution play_arrow
question_answer 249)
Which one of the following is a wrong statement about cast iron [KCET 1998]
A)
It is also called pig iron done
clear
B)
It contains about 4.5% carbon done
clear
C)
It is corrosion resistant done
clear
D)
It contracts on cooling done
clear
View Solution play_arrow
question_answer 250)
Iron pipes lying under acidic soil are often attached to blocks of magnesium for protection from rusting. Magnesium offers protection to iron against corrosion because it [KCET 1998]
A)
Is more readily converted into positive ions done
clear
B)
Is lighter than iron done
clear
C)
Forms a corrosion-resistant alloy with iron done
clear
D)
Prevents air from reaching the surface of iron done
clear
View Solution play_arrow
question_answer 251)
\[Fe{{S}_{2}}\] is [RPET 1999]
A)
Artificial silver done
clear
B)
Fool?s gold done
clear
C)
Mohr?s salt done
clear
D)
Cast iron done
clear
View Solution play_arrow
question_answer 252)
Stainless steel is an alloy of iron with [DCE 1999]
A)
8% Cr, 50% Mn done
clear
B)
10% Ni, 2% Mn done
clear
C)
2% Cr, 3% C done
clear
D)
12% Cr, 1% N done
clear
View Solution play_arrow
question_answer 253)
The chemical processes in the production of steel from haematite ore involve [IIT-JEE (Screening) 2000]
A)
Reduction done
clear
B)
Oxidation done
clear
C)
Reduction followed by oxidation done
clear
D)
Oxidation followed by reduction done
clear
View Solution play_arrow
question_answer 254)
The protection of steel by chrome plating is due to [MP PMT 2001]
A)
Cathodic protection done
clear
B)
Anodic protection done
clear
C)
Covering of steel surface done
clear
D)
Formation of alloy with iron done
clear
View Solution play_arrow
question_answer 255)
The most convenient method to protect bottom of ship made of iron is [CBSE PMT 2001; Kerala (Engg.) 2002]
A)
White tin platting done
clear
B)
Coating with red lead oxide done
clear
C)
Connecting with ?Pb? block done
clear
D)
Connecting with ?Mg? block done
clear
View Solution play_arrow
question_answer 256)
Carbon monoxide reacts with iron to form [KCET (Med.) 2001]
A)
\[Fe{{(CO)}_{5}}\] done
clear
B)
\[FeC{{O}_{2}}\] done
clear
C)
\[FeO+C\] done
clear
D)
\[F{{e}_{2}}{{O}_{3}}+C\] done
clear
View Solution play_arrow
question_answer 257)
Iron is extracted from magnetite by reduction with [UPSEAT 2001]
A)
\[{{H}_{2}}\] done
clear
B)
C done
clear
C)
Mg done
clear
D)
Al done
clear
View Solution play_arrow
question_answer 258)
Malachite is a mineral of [MP PMT 1990; MP PET 1992, 98, 2000; MP PMT 1998]
A)
\[Zn\] done
clear
B)
\[Fe\] done
clear
C)
\[Hg\] done
clear
D)
\[Cu\] done
clear
View Solution play_arrow
question_answer 259)
The most important oxidation state of copper is [MP PMT 1987]
A)
+ 1 done
clear
B)
+ 2 done
clear
C)
+ 3 done
clear
D)
+ 4 done
clear
View Solution play_arrow
question_answer 260)
Hot and conc. nitric acid when reacts with copper, the gas obtained is
A)
\[{{N}_{2}}\] done
clear
B)
Nitrous oxide done
clear
C)
\[NO\] done
clear
D)
\[N{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 261)
Which of the following property is not expected to be shown by copper [MP PET/PMT 1988; NCERT 1975; MP PET 1989]
A)
High thermal conductivity done
clear
B)
Low electrical conductivity done
clear
C)
Ductility done
clear
D)
Malleability done
clear
View Solution play_arrow
question_answer 262)
Which of the following metal gives more than one chloride
A)
\[Cu\] done
clear
B)
\[Al\] done
clear
C)
\[Ag\] done
clear
D)
\[Na\] done
clear
View Solution play_arrow
question_answer 263)
The metal which is the best conductor of electricity is [CPMT 1996]
A)
Iron done
clear
B)
Copper done
clear
C)
Silver done
clear
D)
Aluminium done
clear
View Solution play_arrow
question_answer 264)
Paris green is
A)
Double salt of copper carbonate and copper nitrate done
clear
B)
Double salt of copper acetate and copper arsinite done
clear
C)
Double salt of copper acetate and copper sulphate done
clear
D)
Double salt of copper and silver nitrate done
clear
View Solution play_arrow
question_answer 265)
Reaction between the following pairs will produce \[{{H}_{2}}\] except [CPMT 1973; CBSE PMT 1998]
A)
\[Na+\] ethyl alcohol done
clear
B)
\[Fe+\] steam done
clear
C)
\[Fe+{{H}_{2}}S{{O}_{4}}\] (aq.) done
clear
D)
\[Cu+HCl\] (aq.) done
clear
View Solution play_arrow
question_answer 266)
Which of the following is correct [BHU 1995]
A)
Gun metal :\[Cu+Zn+Sn\] done
clear
B)
Duralumin : \[Al+Cu+Mg+Ag\] done
clear
C)
German silver : \[Cu+Zn+C\] done
clear
D)
Solder : \[Pb+Al\] done
clear
View Solution play_arrow
question_answer 267)
Solder is an alloy of [IIT 1995; MP PET 1995; AFMC 2005]
A)
70% lead, 30% tin done
clear
B)
30% lead, 70% tin done
clear
C)
80% lead, 20% tin done
clear
D)
90% Cu, 10% tin done
clear
View Solution play_arrow
question_answer 268)
Zinc forms two important alloys, (i) Brass and (ii) German silver. Metals present in them mainly are
A)
In (i) zinc and tin; and in (ii) zinc, silver and nickel done
clear
B)
In (i) zinc and iron; and in (ii) zinc, nickel and cobalt done
clear
C)
In (i) zinc and copper; and in (ii) zinc, copper and nickel done
clear
D)
In (i) zinc and aluminium; and in (ii) zinc, nickel and aluminium done
clear
View Solution play_arrow
question_answer 269)
One of the constituent of german silver is [IIT 1980; Kurukshetra CEE 1998; DCE 1999]
A)
Ag done
clear
B)
\[Cu\] done
clear
C)
\[Mg\] done
clear
D)
\[Al\] done
clear
View Solution play_arrow
question_answer 270)
Gun metal is an alloy of [MP PMT 1990; CPMT 1997]
A)
\[Cu\] and \[Al\] done
clear
B)
\[Cu,\,Sn\] and \[Zn\] done
clear
C)
\[Cu,\,Zn\] and \[Ni\] done
clear
D)
\[Cu\] and \[Sn\] done
clear
View Solution play_arrow
question_answer 271)
Besides \[Zn\] and \[Cu\], german silver contains the metal [MP PET 1997]
A)
\[Sn\] done
clear
B)
\[Ag\] done
clear
C)
\[Ni\] done
clear
D)
\[Mg\] done
clear
View Solution play_arrow
question_answer 272)
Which metal is present in brass, bronze and German silver [CPMT 1997; AFMC 1998; AIIMS 1999; J & K 2005]
A)
\[Zn\] done
clear
B)
\[Mg\] done
clear
C)
\[Cu\] done
clear
D)
\[Al\] done
clear
View Solution play_arrow
question_answer 273)
Which of the following is wrongly matched [KCET (Med.) 1999]
A)
German silver \[Cu+Zn+Ni\] done
clear
B)
Alnico \[Fe+Al+Ni+CO\] done
clear
C)
Monel metal \[Cu+Zn+Sn\] done
clear
D)
Duralumin \[Al+Cu+Mg+Mn\] done
clear
View Solution play_arrow
question_answer 274)
An extremely hot copper wire reacts with steam to give [CPMT 1988]
A)
\[CuO\] done
clear
B)
\[C{{u}_{2}}O\] done
clear
C)
\[C{{u}_{2}}{{O}_{2}}\] done
clear
D)
\[Cu{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 275)
From a solution of \[CuS{{O}_{4}}\], the metal used to recover copper is [MP PET 1992; CPMT 1990]
A)
Sodium done
clear
B)
Iron done
clear
C)
Silver done
clear
D)
\[Hg\] done
clear
View Solution play_arrow
question_answer 276)
Copper sulphate is commercially made from copper scraps by [CPMT 1973]
A)
Dissolving in hot conc. \[{{H}_{2}}S{{O}_{4}}\] done
clear
B)
The action of dil. \[{{H}_{2}}S{{O}_{4}}\] and air done
clear
C)
Heating with sodium sulphate done
clear
D)
Heating with sulphur done
clear
View Solution play_arrow
question_answer 277)
Cuprous ion is colourless, while cupric ion is coloured because [EAMCET 1992; BHU 2002]
A)
Both have unpaired electrons in \[d\]-orbital done
clear
B)
Cuprous ion has a completed \[d\]-orbital and cupric ion has an incomplete \[d\]-orbital done
clear
C)
Both have half-filled \[p\]and \[d\]-orbitals done
clear
D)
Cuprous ion has incomplete \[d\]-orbital and cupric ion has a completed \[d\]-orbital done
clear
View Solution play_arrow
question_answer 278)
A blue colouration is not obtained when [CBSE PMT 1989]
A)
Ammonium hydroxide dissolves in copper sulphate done
clear
B)
Copper sulphate solution reacts with \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] done
clear
C)
Ferric chloride reacts with sodium ferrocyanide done
clear
D)
Anhydrous \[CuS{{O}_{4}}\] is dissolved in water done
clear
View Solution play_arrow
question_answer 279)
Identify the statement which is not correct regarding \[CuS{{O}_{4}}\] [MNR 1992; Pb. PMT 1998]
A)
It reacts with \[KI\] to give iodine done
clear
B)
It reacts with \[KCl\] to give \[C{{u}_{2}}C{{l}_{2}}\] done
clear
C)
It reacts with \[NaOH\] and glucose to give \[C{{u}_{2}}O\] done
clear
D)
It gives \[CuO\] on strong heating in air done
clear
View Solution play_arrow
question_answer 280)
Copper sulphate solution reacts with \[KCN\] to give [MP PMT 1992; MNR 1994; IIT 1996; AIIMS 1999; CBSE PMT 2002]
A)
\[Cu{{(CN)}_{2}}\] done
clear
B)
\[CuCN\] done
clear
C)
\[{{K}_{2}}[Cu{{(CN)}_{4}}]\] done
clear
D)
\[{{K}_{3}}[Cu{{(CN)}_{4}}]\] done
clear
View Solution play_arrow
question_answer 281)
If excess of \[N{{H}_{4}}OH\] is added to \[CuS{{O}_{4}}\] solution, it forms blue coloured complex which is [MP PMT 1971, 79; Bihar CEE 1995; RPET 1999; AFMC 2001]
A)
\[Cu{{(N{{H}_{3}})}_{4}}S{{O}_{4}}\] done
clear
B)
\[Cu{{(N{{H}_{3}})}_{2}}S{{O}_{4}}\] done
clear
C)
\[Cu{{(N{{H}_{4}})}_{4}}S{{O}_{4}}\] done
clear
D)
\[Cu{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 282)
Which of the following metals displaces \[S{{O}_{2}}\] gas from concentrated sulphuric acid
A)
\[Mg\] done
clear
B)
\[Zn\] done
clear
C)
\[Cu\] done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 283)
The method of zone refining of metals is based on the principle of [CBSE PMT 2003]
A)
Greater solubility of the impurity in the molten state than in the solid done
clear
B)
Greater mobility of the pure metal than that of the impurity done
clear
C)
Higher melting point of the impurity than that of the pure metal done
clear
D)
Greater noble character of the solid metal than that of the impurity done
clear
View Solution play_arrow
question_answer 284)
A metal when left exposed to the atmosphere for some time becomes coated with green basic carbonate. The metal in question is [NDA 1999]
A)
Copper done
clear
B)
Nickel done
clear
C)
Silver done
clear
D)
Zinc done
clear
View Solution play_arrow
question_answer 285)
When \[CuS{{O}_{4}}\] solution is added to\[{{K}_{4}}[Fe{{(CN)}_{6}}]\], the formula of the product formed is [Bihar CEE 1995]
A)
\[C{{u}_{2}}Fe{{(CN)}_{6}}\] done
clear
B)
\[KCN\] done
clear
C)
\[Cu{{(CN)}_{3}}\] done
clear
D)
\[Cu{{(CN)}_{2}}\] done
clear
View Solution play_arrow
question_answer 286)
\[MnO_{4}^{-}\] on reduction in acidic medium forms [MP PMT 1995]
A)
\[Mn{{O}_{2}}\] done
clear
B)
\[M{{n}^{++}}\] done
clear
C)
\[MnO_{4}^{--}\] done
clear
D)
\[Mn\] done
clear
View Solution play_arrow
question_answer 287)
Which of the following metals will not react with a solution of \[CuS{{O}_{4}}\] [CPMT 1996]
A)
\[Fe\] done
clear
B)
\[Zn\] done
clear
C)
\[Mg\] done
clear
D)
\[Hg\] done
clear
View Solution play_arrow
question_answer 288)
Which one of the following metals will not reduce \[{{H}_{2}}O\] [EAMCET 1997]
A)
\[Ca\] done
clear
B)
\[Fe\] done
clear
C)
\[Cu\] done
clear
D)
\[Li\] done
clear
View Solution play_arrow
question_answer 289)
The reaction, which forms nitric oxide, is [KCET (Med.) 2001]
A)
C and \[{{N}_{2}}O\] done
clear
B)
\[Cu\] and \[{{N}_{2}}O\] done
clear
C)
\[Na\] and \[N{{H}_{3}}\] done
clear
D)
\[Cu\] and \[HN{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 290)
A cuprous ore among the following is [KCET 2002]
A)
Cuprite done
clear
B)
Malachite done
clear
C)
Chalcopyrites done
clear
D)
Azurite done
clear
View Solution play_arrow
question_answer 291)
When metallic copper comes in contact with moisture, a green powdery/ pasty coating can be seen over it. This is chemically known as [AFMC 2002]
A)
Copper sulphide - Copper carbonate done
clear
B)
Copper carbonate - Copper sulphate done
clear
C)
Copper carbonate - Copper hydroxide done
clear
D)
Copper Sulphate - Copper sulphide done
clear
View Solution play_arrow
question_answer 292)
Orford process is used in extraction of
A)
\[Fe\] done
clear
B)
\[Co\] done
clear
C)
\[Pt\] done
clear
D)
\[Ni\] done
clear
View Solution play_arrow
question_answer 293)
Horn silver is
A)
\[AgCl\] done
clear
B)
\[Ag\] done
clear
C)
\[AgBr\] done
clear
D)
\[C{{H}_{3}}COOAg\] done
clear
View Solution play_arrow
question_answer 294)
Which of the following is used in photography [CPMT 1980]
A)
\[AgCl\] done
clear
B)
\[AgBr\] done
clear
C)
\[AgI\] done
clear
D)
\[A{{g}_{2}}O\] done
clear
View Solution play_arrow
question_answer 295)
Silver halides are used in photography because [MP PMT 1989]
A)
They are photosensitive done
clear
B)
Soluble in hypo done
clear
C)
Soluble in \[N{{H}_{4}}OH\] done
clear
D)
Soluble in acids done
clear
View Solution play_arrow
question_answer 296)
\[AgCl\] when heated with \[N{{a}_{2}}C{{O}_{3}}\] gives [CPMT 1980; MP PET 1989; MP PMT 1982, 84]
A)
\[A{{g}_{2}}O\] done
clear
B)
\[Ag\] done
clear
C)
\[A{{g}_{2}}C{{O}_{3}}\] done
clear
D)
\[NaAgC{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 297)
\[AgN{{O}_{3}}\] gives a red ppt. with [NCERT 1972; BHU 1978; MP PMT 1995]
A)
\[KI\] done
clear
B)
\[NaBr\] done
clear
C)
\[NaN{{O}_{3}}\] done
clear
D)
\[{{K}_{2}}Cr{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 298)
Silver nitrate is prepared by [CPMT 1984]
A)
The action of only conc. \[HN{{O}_{3}}\] on silver done
clear
B)
Heating silver oxide with \[N{{O}_{2}}\] done
clear
C)
The action of hot dil. \[HN{{O}_{3}}\] on silver done
clear
D)
Dissolve \[Ag\] in aqua-regia done
clear
View Solution play_arrow
question_answer 299)
\[AgCl\] is soluble in [EAMCET 1992]
A)
Aqua-regia done
clear
B)
\[{{H}_{2}}S{{O}_{4}}\] done
clear
C)
\[HCl\] done
clear
D)
\[N{{H}_{3}}\] (aq) done
clear
View Solution play_arrow
question_answer 300)
Which of the following is least soluble in water [NCERT 1974, 78; MNR 1984, 89]
A)
\[AgI\] done
clear
B)
\[AgCl\] done
clear
C)
\[AgBr\] done
clear
D)
\[A{{g}_{2}}S\] done
clear
View Solution play_arrow
question_answer 301)
Photographic films and plates have an essential ingredient of [CPMT 1980; CBSE PMT 1989]
A)
Silver nitrate done
clear
B)
Silver bromide done
clear
C)
Sodium chloride done
clear
D)
Oleic acid done
clear
View Solution play_arrow
question_answer 302)
Which of the following does not react with \[AgCl\] [AIIMS 1997]
A)
\[NaN{{O}_{3}}\] done
clear
B)
\[N{{a}_{2}}C{{O}_{3}}\] done
clear
C)
\[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] done
clear
D)
\[N{{H}_{4}}OH\] done
clear
View Solution play_arrow
question_answer 303)
Which one of the following is known as lunar caustic when in fused state [MP PMT 1999; JIPMER 2002]
A)
Silver nitrate done
clear
B)
Silver sulphate done
clear
C)
Silver chloride done
clear
D)
Sodium sulphate done
clear
View Solution play_arrow
question_answer 304)
Which silver halide is used in medicine [DPMT 1996]
A)
\[AgN{{O}_{3}}\] done
clear
B)
\[AgCl\] done
clear
C)
\[AgBr\] done
clear
D)
\[AgF\] done
clear
View Solution play_arrow
question_answer 305)
When silver nitrate is heated to red hot, what is formed [CPMT 1996; NCERT 1970]
A)
\[Ag\] done
clear
B)
\[A{{g}_{2}}O\] done
clear
C)
\[A{{g}_{2}}{{O}_{3}}\] done
clear
D)
\[Ag{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 306)
For making \[Ag\] from \[AgN{{O}_{3}}\], which of the following is used [AFMC 1998]
A)
\[P{{H}_{3}}\] done
clear
B)
\[As{{H}_{3}}\] done
clear
C)
\[N{{a}_{2}}C{{O}_{3}}\] done
clear
D)
\[N{{H}_{3}}\] done
clear
View Solution play_arrow
question_answer 307)
Which one of the following reacts with concentrated sulphuric acid [EAMCET 1998]
A)
\[Au\] done
clear
B)
\[Ag\] done
clear
C)
\[Pt\] done
clear
D)
\[Pb\] done
clear
View Solution play_arrow
question_answer 308)
The nitrate of which metal left globule on heating strongly [JIPMER 2001]
A)
\[Pb{{(N{{O}_{3}})}_{2}}\] done
clear
B)
\[NaN{{O}_{3}}\] done
clear
C)
\[AgN{{O}_{3}}\] done
clear
D)
\[Cu{{(N{{O}_{3}})}_{2}}\] done
clear
View Solution play_arrow
question_answer 309)
During extraction of silver, which of the following is formed [MP PET 2002]
A)
\[Na[Ag{{(CN)}_{2}}]\] done
clear
B)
\[N{{a}_{2}}[Ag{{(CN)}_{2}}]\] done
clear
C)
\[N{{a}_{4}}[Ag{{(CN)}_{2}}]\] done
clear
D)
None of these done
clear
View Solution play_arrow
question_answer 310)
Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution will turn Blue [MP PET 2002]
A)
\[KN{{O}_{3}}\] done
clear
B)
\[AgN{{O}_{3}}\] done
clear
C)
\[Zn{{(N{{O}_{3}})}_{2}}\] done
clear
D)
\[ZnS{{O}_{4}}\] done
clear
View Solution play_arrow
question_answer 311)
Zinc when reacted with excess of \[NaOH\] gives [CPMT 1974, 78, 94; MP PMT 1999]
A)
Zinc hydroxide done
clear
B)
Zinc oxide done
clear
C)
Di sodium zincate done
clear
D)
Sodium zincate done
clear
View Solution play_arrow
question_answer 312)
Pair of metals which dissolves in \[NaOH\] solution
A)
\[Al,\,Cu\] done
clear
B)
\[Zn,\,Hg\] done
clear
C)
\[Zn,\,Cu\] done
clear
D)
\[Zn,\,Al\] done
clear
View Solution play_arrow
question_answer 313)
Lucas reagent is [CPMT 1980; AIIMS 1980, 82; DPMT 1983; MP PET 1995; MP PMT 1997, 98]
A)
Anhydrous \[ZnC{{l}_{2}}+conc.\,HCl\] done
clear
B)
Hydrous \[ZnC{{l}_{2}}+dil.\,HCl\] done
clear
C)
Conc. \[HN{{O}_{3}}+\] anhydrous \[ZnC{{l}_{2}}\] done
clear
D)
Conc. \[HN{{O}_{3}}+\] anhydrous \[MgC{{l}_{2}}\] done
clear
View Solution play_arrow
question_answer 314)
What is the effect of shaking dil. \[{{H}_{2}}S{{O}_{4}}\] with small quantity of anhydrous \[CuS{{O}_{4}}\] [NCERT 1975; CPMT 1975, 88]
A)
The white solid dissolves to form a colourless solution done
clear
B)
The white solid dissolves to form a green solution done
clear
C)
The white solid turns blue but does not dissolve done
clear
D)
The white solid dissolves to form a blue solution done
clear
View Solution play_arrow
question_answer 315)
Which metal is electro-deposited on iron surface to prevent rusting [MP PET 1990]
A)
\[Cu\] done
clear
B)
\[Zn\] done
clear
C)
\[Mg\] done
clear
D)
\[Pb\] done
clear
View Solution play_arrow
question_answer 316)
To prevent corrosion, iron pipes carrying drinking water are covered with zinc. The process involved is [CPMT 1986; MP PMT 1993; MP PET 1999]
A)
Photoelectrolysis done
clear
B)
Electroplating done
clear
C)
Galvanization done
clear
D)
Cathodic protection done
clear
View Solution play_arrow
question_answer 317)
From aqueous solution of \[ZnS{{O}_{4}}\], normal zinc carbonate may be precipitated by [CPMT 1973]
A)
Boiling with \[CaC{{O}_{3}}\] done
clear
B)
Adding \[N{{a}_{2}}C{{O}_{3}}\] done
clear
C)
Adding \[NaHC{{O}_{3}}\] done
clear
D)
Passing \[C{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 318)
Which one of the following dissolve in hot concentrated \[NaOH\] solution [IIT 1980]
A)
\[Fe\] done
clear
B)
\[Zn\] done
clear
C)
\[Cu\] done
clear
D)
\[Ag\] done
clear
View Solution play_arrow
question_answer 319)
Which of the following metal forms an amphoteric oxide [CPMT 1976]
A)
\[Ca\] done
clear
B)
\[Fe\] done
clear
C)
\[Cu\] done
clear
D)
\[Zn\] done
clear
View Solution play_arrow
question_answer 320)
Reaction of zinc with cold and very dilute nitric acid yields [MP PET 1985, 92, 97; BHU 1995, 2000; NCERT 1974; MP PMT 1995]
A)
\[Zn{{(N{{O}_{3}})}_{2}}+{{N}_{2}}O\] done
clear
B)
\[Zn{{(N{{O}_{3}})}_{2}}+NO\] done
clear
C)
\[Zn{{(N{{O}_{3}})}_{2}}+N{{H}_{4}}N{{O}_{3}}\] done
clear
D)
\[Zn{{(N{{O}_{3}})}_{2}}+N{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 321)
The number of unpaired electrons in \[Z{{n}^{2+}}\] is
A)
2 done
clear
B)
3 done
clear
C)
4 done
clear
D)
0 done
clear
View Solution play_arrow
question_answer 322)
The trace metal present in insulin is [KCET 1991]
A)
Iron done
clear
B)
Cobalt done
clear
C)
Zinc done
clear
D)
Manganese done
clear
View Solution play_arrow
question_answer 323)
The chemical name of borax is [CPMT 1994]
A)
Sodium orthoborate done
clear
B)
Sodium metaborate done
clear
C)
Sodium tetraborate done
clear
D)
Sodium tetraborate decahydrate done
clear
View Solution play_arrow
question_answer 324)
Hydrogen is not obtained when zinc reacts with [CPMT 1994]
A)
Cold water done
clear
B)
Dilute \[{{H}_{2}}S{{O}_{4}}\] done
clear
C)
Dilute \[HCl\] done
clear
D)
Hot 20% \[NaOH\] done
clear
View Solution play_arrow
question_answer 325)
The metal which gives hydrogen on treatment with acid as well as sodium hydroxide is [MP PET 1996]
A)
Iron done
clear
B)
Zinc done
clear
C)
Copper done
clear
D)
None of the above done
clear
View Solution play_arrow
question_answer 326)
To protect iron against corrosion, the most durable metal plating on it, is [CBSE PMT 1994]
A)
Nickel plating done
clear
B)
Tin plating done
clear
C)
Copper plating done
clear
D)
Zinc plating done
clear
View Solution play_arrow
question_answer 327)
The compound \[ZnF{{e}_{2}}{{O}_{4}}\]is [Kerala (Engg.) 2002]
A)
A normal spinel compound done
clear
B)
Interstitial compound done
clear
C)
Covalent compound done
clear
D)
Co-ordination compound done
clear
View Solution play_arrow
question_answer 328)
\[ZnO\] when heated with \[BaO\] at \[1100{}^\circ C\] gives a compound. Identify the compound [AFMC 2002]
A)
\[BaZn{{O}_{2}}\] done
clear
B)
\[Ba{{O}_{2}}+Zn\] done
clear
C)
\[BaCd{{O}_{2}}\] done
clear
D)
\[Ba+Zn{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 329)
Zn gives hydrogen gas with \[{{H}_{2}}S{{O}_{4}}\]and \[HCl\] but not with \[HN{{O}_{3}}\] because [CBSE PMT 2002]
A)
\[N{{O}_{2}}\]is reduced in preference to \[{{H}_{3}}{{O}^{+}}\] done
clear
B)
\[HN{{O}_{3}}\]is weaker acid than \[{{H}_{2}}S{{O}_{4}}\] and \[HCl\] done
clear
C)
\[Zn\]acts as oxidising agent when reacts with \[HN{{O}_{3}}\] done
clear
D)
In electrochemical series \[Zn\]is placed above the hydrogen done
clear
View Solution play_arrow
question_answer 330)
The metal used for making radiation shield is [Kerala (Med.) 2002]
A)
Aluminium done
clear
B)
Iron done
clear
C)
Zinc done
clear
D)
Lead done
clear
View Solution play_arrow
question_answer 331)
Which of the following metal is obtained by leaching out process using a solution of \[NaCN\] and then precipitating the metal by addition of zinc dust [NCERT 1984; AIIMS 1983; CBSE PMT 1989]
A)
Copper done
clear
B)
Silver done
clear
C)
Nickel done
clear
D)
Iron done
clear
View Solution play_arrow
question_answer 332)
While extracting an element from its ore, the ore is ground and leached with dilute \[KCN\] solution to form the soluble product potassium argentocyanide. The element is [CBSE PMT 1989]
A)
Lead done
clear
B)
Chromium done
clear
C)
Manganese done
clear
D)
Silver done
clear
View Solution play_arrow
question_answer 333)
In Mc Arthur Forest method, silver is extracted from the solution of \[Na[Ag{{(CN)}_{2}}]\] by the use of: [CPMT 2004]
A)
Fe done
clear
B)
Mg done
clear
C)
Cu done
clear
D)
Zn done
clear
View Solution play_arrow
question_answer 334)
Iron obtained from blast furnace is known as [DPMT 1981; CPMT 1988; MP PET 2000]
A)
Wrought iron done
clear
B)
Cast iron done
clear
C)
Pig iron done
clear
D)
Steel done
clear
View Solution play_arrow
question_answer 335)
Extraction of silver from commercial lead is possible by [BHU 1979]
A)
Mond's process done
clear
B)
Park's process done
clear
C)
Haber's process done
clear
D)
Clark's process done
clear
View Solution play_arrow
question_answer 336)
Impurities of lead in silver are removed by [AllMS 1987]
A)
Park process done
clear
B)
Solvey process done
clear
C)
Cyanide process done
clear
D)
Amalgamation process done
clear
View Solution play_arrow
question_answer 337)
Park's process is used in the extraction of [BHU 1977; CBSE PMT 1992; MP PMT 1996; Kurukshetra CEE 1998]
A)
Iron done
clear
B)
Zinc done
clear
C)
Silver done
clear
D)
Lead done
clear
View Solution play_arrow
question_answer 338)
From argentite \[(A{{g}_{2}}S)\] ore the method used in obtaining metallic silver is [MP PMT 1989]
A)
Fused mixture of \[A{{g}_{2}}S\] and \[KCl\] is electrolysed done
clear
B)
\[A{{g}_{2}}S\] is reduced with \[CO\] done
clear
C)
\[A{{g}_{2}}S\]is roasted to \[A{{g}_{2}}O\]which is reduced with carbon done
clear
D)
Treating argentite with \[NaCN\] solution followed by metal displacement with zinc done
clear
View Solution play_arrow
question_answer 339)
In the extraction of zinc which gas is burnt in the jackets surrounding the retorts
A)
Water gas done
clear
B)
Producer gas done
clear
C)
Oil gas done
clear
D)
Coal gas done
clear
View Solution play_arrow
question_answer 340)
MacArther process is used for [BHU 1995]
A)
\[Hg\] done
clear
B)
\[Fe\] done
clear
C)
\[Cl\] done
clear
D)
\[{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 341)
In the metallurgy of zinc, the zinc dust obtained from roasting and reduction of zinc sulphide contains some ZnO. How is this removed [MP PET 1993; AFMC 2002]
A)
Absorbance of ultraviolet light and re-emission of white light is employed done
clear
B)
Shock cooling by contact with a shower of molten lead is done done
clear
C)
X-ray method is used done
clear
D)
Smelting is employed done
clear
View Solution play_arrow
question_answer 342)
In the metallurgy of copper, metallic copper is finally formed in the furnace by the reactions
A)
\[C{{u}_{2}}S+{{O}_{2}}\to 2Cu+S{{O}_{2}}\] done
clear
B)
\[2CuS+3{{O}_{2}}\to 2CuO+2S{{O}_{2}}\] \[2CuO+CuS\to 3Cu+S{{O}_{2}}\] done
clear
C)
\[2C{{u}_{2}}S+3{{O}_{2}}\to 2C{{u}_{2}}O+2S{{O}_{2}}\] \[C{{u}_{2}}S+2C{{u}_{2}}O\to 6Cu+S{{O}_{2}}\] done
clear
D)
\[CuS+{{O}_{2}}\to Cu+S{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 343)
In the smelting of roasted copper pyrites ore, melting occurs so that the first reaction is
A)
All the sulphur preferentially combines with iron to form \[FeS\] and \[CuO\] is formed done
clear
B)
All the sulphur preferentially combines with copper to form \[CuS\] and \[FeO\] is formed done
clear
C)
All the sulphur preferentially combines with iron to form \[FeS\] and \[C{{u}_{2}}O\] is formed done
clear
D)
All the sulphur preferentially combines with copper to form \[C{{u}_{2}}S\] and \[FeO\] is formed done
clear
View Solution play_arrow
question_answer 344)
In the oxidation of \[Cu\], the reaction which takes place in bessemer converter is [CPMT 1999]
A)
\[2CuFe{{S}_{2}}+{{O}_{2}}\to C{{u}_{2}}S+FeS+S{{O}_{2}}\] done
clear
B)
\[2C{{u}_{2}}S+3{{O}_{2}}\to 2C{{u}_{2}}O+2S{{O}_{2}}\] done
clear
C)
\[2C{{u}_{2}}O+C{{u}_{2}}S\to 6Cu+S{{O}_{2}}\] done
clear
D)
\[2FeS+3{{O}_{2}}\to 2FeO+2S{{O}_{2}}\] done
clear
View Solution play_arrow
question_answer 345)
Silica is added to roasted copper ore during smelting in order to remove [KCET 1998]
A)
Cuprous sulphide done
clear
B)
Cuprous oxide done
clear
C)
Ferrous oxide done
clear
D)
Ferrous sulphide done
clear
View Solution play_arrow
question_answer 346)
Parke's process is used to extract [MP PMT 2002]
A)
Silver using \[NaCN\] done
clear
B)
Copper using \[CuFe{{S}_{2}}\] done
clear
C)
Silver from argentiferrous lead done
clear
D)
Silver by forming amalgam done
clear
View Solution play_arrow
question_answer 347)
Identify the reaction that doesn't take place during the smelting process of copper extraction [KCET 2003]
A)
\[2FeS+3\,{{O}_{2}}\to 2\,FeO+2\,S{{O}_{2}}\uparrow \] done
clear
B)
\[C{{u}_{2}}O+FeS\to C{{u}_{2}}S+FeO\] done
clear
C)
\[2C{{u}_{2}}S+3\,{{O}_{2}}\to 2C{{u}_{2}}O+2S{{O}_{2}}\uparrow \] done
clear
D)
\[FeO+Si{{O}_{2}}\to FeSi{{O}_{3}}\] done
clear
View Solution play_arrow
question_answer 348)
The extraction of which of the following metals involves bessemerisation [DCE 2004]
A)
Fe done
clear
B)
Ag done
clear
C)
Al done
clear
D)
Cu done
clear
View Solution play_arrow
question_answer 349)
Bessemer converter is used for [AFMC 2004]
A)
Steel done
clear
B)
Wrought iron done
clear
C)
Pig iron done
clear
D)
Cast iron done
clear
View Solution play_arrow
question_answer 350)
In the cyanide process for the extraction of silver, sodium cyanide is used to [MP PMT 1994]
A)
Convert silver into a soluble silver complex done
clear
B)
Reduce silver done
clear
C)
Precipitate silver done
clear
D)
Oxidise silver done
clear
View Solution play_arrow
question_answer 351)
Parke's process of desilverization of lead depends upon
A)
Partition coefficient of silver between molten zinc / molten lead having a high value done
clear
B)
Partition coefficient of silver between molten zinc/molten lead having a low value done
clear
C)
Crystallizing out of pure lead while the silver-lead eutectic which has a lower melting point is left behind in liquid form done
clear
D)
Chemical combination of zinc and silver which precipitates out easily done
clear
View Solution play_arrow
question_answer 352)
Which is impure form of iron
A)
Cast iron done
clear
B)
Wrought iron done
clear
C)
Steel iron done
clear
D)
None done
clear
View Solution play_arrow
question_answer 353)
Blister copper is [CPMT 1976, 85, 2002; DPMT 1982; MP PET 1995; Bihar CEE 1995]
A)
Pure copper done
clear
B)
Ore of copper done
clear
C)
Alloy of copper done
clear
D)
1% impure copper done
clear
View Solution play_arrow
question_answer 354)
In the extraction of copper when molten copper is cooled slowly, blister copper is obtained due to evolution of the following gas
A)
Water vapour done
clear
B)
Sulphur dioxide done
clear
C)
Carbon dioxide done
clear
D)
Carbon monoxide done
clear
View Solution play_arrow
question_answer 355)
In the electrolytic purification of copper some gold is found in the [CPMT 1972; AFMC 1995; RPET 2003]
A)
Cathode done
clear
B)
Cathode mud done
clear
C)
Anode mud done
clear
D)
Electrolyte done
clear
View Solution play_arrow
question_answer 356)
Purest form of iron is [CPMT 1975, 80, 84, 87, 89; DPMT 1982, 83; MP PMT 1987, 90, 91; MP PET 1995; BHU 1999; MH CET 2003]
A)
Cast iron done
clear
B)
Wrought iron done
clear
C)
Hot steel done
clear
D)
Stainless steel done
clear
View Solution play_arrow
question_answer 357)
Spelter is [CPMT 1988]
A)
Impure \[Cu\] done
clear
B)
Impure \[Zn\] done
clear
C)
Zn\[O\] done
clear
D)
\[CuO\] done
clear
View Solution play_arrow
question_answer 358)
A copper coin is completely covered with a gold film and is placed in dilute \[HN{{O}_{3}}\]. This will result in formation of [CPMT 1981]
A)
Gold nitrate done
clear
B)
Copper nitrate done
clear
C)
None of these done
clear
D)
Purple of cassins done
clear
View Solution play_arrow
question_answer 359)
When zinc is added to \[CuS{{O}_{4}}\] copper gets ppt. due to [CPMT 1979]
A)
Reduction of copper ions done
clear
B)
Oxidation of copper ions done
clear
C)
Hydrolysis of copper sulphate done
clear
D)
Complex formation done
clear
View Solution play_arrow
question_answer 360)
Addition of iron filings to \[CuS{{O}_{4}}\] solution caused precipitation of \[Cu\] owing to the [CPMT 1990]
A)
Reduction of \[C{{u}^{++}}\] done
clear
B)
Oxidation of \[C{{u}^{++}}\] done
clear
C)
Reduction of \[Fe\] done
clear
D)
Reduction of \[F{{e}^{+++}}\] done
clear
View Solution play_arrow
question_answer 361)
Oxygen gas can be prepared from solid \[KMn{{O}_{4}}\] by [DPMT 2001]
A)
Strongly heating the solid done
clear
B)
Treating the solid with \[{{H}_{2}}\] gas done
clear
C)
Dissolving the solid in dil. \[{{H}_{2}}S{{O}_{4}}\] done
clear
D)
Dissolving the solid in dil. \[HCl\] done
clear
View Solution play_arrow