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question_answer1)
A white solid 'A' on heating gives off a gas which turns lime water milky. The residue is yellow when hot but turns white on cooling. This solid 'A' is [MP PMT 1999]
A)
Zinc sulphate done
clear
B)
Zinc carbonate done
clear
C)
Lead sulphate done
clear
D)
Lead carbonate done
clear
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question_answer2)
A salt on treatment with dil. \[HCl\] gives a pungent smelling gas and a yellow precipitate. The salt gives green flame when tested. The salt solution gives a yellow precipitate with potassium chromate. The salt is [MP PET 1996]
A)
\[NiS{{O}_{4}}\] done
clear
B)
\[Ba{{S}_{2}}{{O}_{3}}\] done
clear
C)
\[Pb{{S}_{2}}{{O}_{3}}\] done
clear
D)
\[CuS{{O}_{4}}\] done
clear
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question_answer3)
The salt used for performing 'bead' test in qualitative inorganic analysis is [UPSEAT 2001]
A)
\[{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] done
clear
B)
\[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\] done
clear
C)
\[Na(N{{H}_{4}})HP{{O}_{4}}.4{{H}_{2}}O\] done
clear
D)
\[CaS{{O}_{4}}2{{H}_{2}}O\] done
clear
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question_answer4)
Where chlorine water is added to an aqueous solution of potassium halide in presence of chloroform, a violet colour is obtained. On adding more of chlorine water, the violet colour disappears, and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution [CPMT 1990]
A)
Iodide done
clear
B)
Bromide done
clear
C)
Chloride done
clear
D)
Iodide and bromide done
clear
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question_answer5)
Upon the addition of a solution A to a strongly acidified solution of barium nitrate, a white precipitate was obtained which did not dissolve even after large addition of water. Solution A contained [NCERT 1971]
A)
Sodium phosphate done
clear
B)
Sodium carbonate done
clear
C)
Sodium sulphate done
clear
D)
Sodium chloride done
clear
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question_answer6)
To an acid solution of an anion a few drops of \[KMn{{O}_{4}}\] solution are added. Which of the following, if present will not decolourise the \[KMn{{O}_{4}}\] solution [MP PMT 1997]
A)
\[NO_{2}^{-}\] done
clear
B)
\[{{S}^{2-}}\] done
clear
C)
\[C{{l}^{-}}\] done
clear
D)
\[CO_{3}^{2-}\] done
clear
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question_answer7)
The brown ring test for NO2 and \[N{{O}_{3}}^{-}\]is due to the formation of complex ion with the formula [KCET (Eng./Med.) 2000; Kerala PMT 2004]
A)
\[{{\left[ Fe{{\left( {{H}_{2}}O \right)}_{6}} \right]}^{2+}}\] done
clear
B)
\[{{\left[ Fe\left( NO \right)\text{ }{{\left( CN \right)}_{5}} \right]}^{2+}}\] done
clear
C)
\[{{\left[ Fe{{\left( {{H}_{2}}O \right)}_{5}}NO \right]}^{2+}}\] done
clear
D)
\[{{\left[ Fe\left( {{H}_{2}}O \right)\text{ }{{\left( NO \right)}_{5}} \right]}^{2+}}\] done
clear
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question_answer8)
Mixture is heated with dil. \[{{H}_{2}}S{{O}_{4}}\] and the lead acetate paper turns black by the evolved gases. The mixture contains
A)
Sulphite done
clear
B)
Sulphide done
clear
C)
Sulphate done
clear
D)
Thiosulphate done
clear
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question_answer9)
To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of \[N{{H}_{4}}OH\]. However, when \[HCl\] is added to the original solution, a white precipitate is formed. The solution contained [BHU 1973]
A)
Lead salt done
clear
B)
Silver salt done
clear
C)
Mercurous salt done
clear
D)
Copper salt done
clear
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question_answer10)
If \[NaOH\] is added to an aqueous solution of zinc ions, a white precipitate appears and on adding excess \[NaOH\], the precipitate dissolves. In this solution zinc exists in the [NCERT 1981; MP PET 1993]
A)
Cationic part done
clear
B)
Anionic part done
clear
C)
Both in cationic and anionic parts done
clear
D)
There is no zinc in the solution done
clear
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question_answer11)
On performing a borax-bead test with a given inorganic mixture for qualitative analysis, the colour of the bead was found to be emerald green both in oxidising and reducing flame. It indicates the possibility of the presence of [MP PMT 2001]
A)
\[C{{o}^{+2}}\] done
clear
B)
\[N{{i}^{+2}}~~~~~~\] done
clear
C)
\[C{{r}^{+3}}\] done
clear
D)
\[C{{u}^{+2}}\] done
clear
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question_answer12)
A red solid is insoluble in water. However it becomes soluble if some KI is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is [AIEEE 2003]
A)
\[{{\left( N{{H}_{4}} \right)}_{2}}C{{r}_{2}}{{O}_{7}}\] done
clear
B)
\[Hg{{I}_{2}}\] done
clear
C)
\[HgO\] done
clear
D)
\[P{{b}_{3}}{{O}_{4}}\] done
clear
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question_answer13)
An aqueous solution of \[FeS{{O}_{4}},A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}\] and chrome alum is heated with excess of \[N{{a}_{2}}{{O}_{2}}\] and filtered. The materials obtained are [IIT 1996]
A)
A colourless filtrate and a green residue done
clear
B)
A yellow filtrate and a green residue done
clear
C)
A yellow filtrate and a brown residue done
clear
D)
A green filtrate and a brown residue done
clear
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question_answer14)
Phosphoric acid \[\left( {{H}_{3}}P{{O}_{4}} \right)\] is tribasic acid and one of its salts is sodium dihydrogen phosphate \[\left( Na{{H}_{2}}P{{O}_{4}} \right)\]. What volume of 1 M \[NaOH\] solution should be added to 12 g of sodium dihydrogen phosphate (mol. wt. 120) to exactly convert it into trisodium phosphate \[N{{a}_{3}}P{{O}_{4}}\] [Kurukshetra CET 1998]
A)
80 ml done
clear
B)
100 ml done
clear
C)
200 ml done
clear
D)
300 ml done
clear
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question_answer15)
Three separate samples of a solution of a single salt gave these test results : One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. \[NaCl\] solution and one formed a black precipitate with \[{{H}_{2}}S\]. The salt could be [Pb. PMT 1998]
A)
\[AgN{{O}_{3}}\] done
clear
B)
\[Pb{{\left( N{{O}_{3}} \right)}_{2}}\] done
clear
C)
\[Hg{{\left( N{{O}_{3}} \right)}_{2}}\] done
clear
D)
\[MnS{{O}_{4}}\] done
clear
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question_answer16)
10 ml of concentrated \[HCl\] were diluted to 1 litre. 20 ml of this diluted solution required 25 ml of 0.1 N sodium hydroxide solution for complete neutralization, the normality of the concentrated hydrochloric acid will be
A)
8.0 done
clear
B)
9.5 done
clear
C)
12.5 done
clear
D)
15.0 done
clear
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question_answer17)
To a 25 ml of \[{{H}_{2}}{{O}_{2}}\]solution, excess of acidified solution of KI was mixed. The liberated I2 require 20ml of 0.3M hypo solution for neutralization. The volume strength of \[{{H}_{2}}{{O}_{2}}\] will be [MP PET 2003]
A)
1.34 ml done
clear
B)
1.44 ml done
clear
C)
1.60 ml done
clear
D)
2.42 ml done
clear
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question_answer18)
A chemistry student trying to detect the metallic ion in a salt, makes a paste on a clean platinum wire loop of the salt with concentrated \[HCl\]. When he takes a small amount of this paste and keeps it in a non-luminous Bunsen flame, the colour of the flame changes to grassy green. He should, therefore, conclude that the metal is [Manipal MEE 1995]
A)
Barium done
clear
B)
Calcium done
clear
C)
Potassium done
clear
D)
Strontium done
clear
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question_answer19)
A white crystalline substance dissolves in water. On passing \[{{H}_{2}}S\] in this solution, a black precipitate is obtained. The black precipitate dissolves completely in hot \[HN{{O}_{3}}\]. On adding a few drops of conc. \[{{H}_{2}}S{{O}_{4}}\] a white precipitate is obtained. This precipitate is that of [CPMT 1990]
A)
\[BaS{{O}_{4}}\] done
clear
B)
\[SrS{{O}_{4}}\] done
clear
C)
\[PbS{{O}_{4}}\] done
clear
D)
\[CdS{{O}_{4}}\] done
clear
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question_answer20)
The best explanation for the solubility of MnS in dil. HCl is that [UPSEAT 2001]
A)
Solubility product of\[MnC{{l}_{2}}\]is less than that of MnS done
clear
B)
Concentration of\[M{{n}^{2+}}\]is lowered by the formation of complex ions with chloride ions done
clear
C)
Concentration of sulphide ions is lowered by oxidation to free sulphur done
clear
D)
Concentration of sulphide ions is lowered by formation of the weak acid \[{{H}_{2}}S\] done
clear
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