-
question_answer1)
\[{{H}_{2}}{{O}_{2}}\] reduces \[Mn{{O}_{4}}^{-}\]ion to [KCET (Med.) 2000]
A)
\[M{{n}^{+}}\] done
clear
B)
\[M{{n}^{2+}}\] done
clear
C)
\[M{{n}^{3+}}\] done
clear
D)
\[M{{n}^{-}}\] done
clear
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question_answer2)
When a sulphur atom becomes a sulphide ion [AMU 1999]
A)
There is no change in the composition of atom done
clear
B)
It gains two electrons done
clear
C)
The mass number changes done
clear
D)
None of these done
clear
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question_answer3)
The ultimate products of oxidation of most of hydrogen and carbon in food stuffs are [DCE 2001]
A)
\[{{H}_{2}}O\] alone done
clear
B)
\[C{{O}_{2}}\]alone done
clear
C)
\[{{H}_{2}}O\] and \[C{{O}_{2}}\] done
clear
D)
None of these done
clear
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question_answer4)
When \[P\] reacts with caustic soda, the products are \[P{{H}_{3}}\] and \[Na{{H}_{2}}P{{O}_{2}}.\] This reaction is an example of [IIT 1980; Kurukshetra CEE 1993; CPMT 1997]
A)
Oxidation done
clear
B)
Reduction done
clear
C)
Oxidation and reduction (Redox) done
clear
D)
Neutralization done
clear
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question_answer5)
Which one of the following does not get oxidised by bromine water [MP PET/PMT 1988]
A)
\[F{{e}^{+2}}\] to \[F{{e}^{+3}}\] done
clear
B)
\[C{{u}^{+}}\] to \[C{{u}^{+2}}\] done
clear
C)
\[M{{n}^{+2}}\] to \[MnO_{4}^{-}\] done
clear
D)
\[S{{n}^{+2}}\] to \[S{{n}^{+4}}\] done
clear
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question_answer6)
In the reaction \[{{H}_{2}}S+N{{O}_{2}}\to {{H}_{2}}O+NO+S.\] \[{{H}_{2}}S\] is
A)
Oxidised done
clear
B)
Reduced done
clear
C)
Precipitated done
clear
D)
None of these done
clear
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question_answer7)
The conversion of \[Pb{{O}_{2}}\] to \[Pb{{(N{{O}_{3}})}_{2}}\]is
A)
Oxidation done
clear
B)
Reduction done
clear
C)
Neither oxidation nor reduction done
clear
D)
Both oxidation and reduction done
clear
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question_answer8)
In the course of a chemical reaction an oxidant [MP PMT 1986]
A)
Loses electrons done
clear
B)
Gains electrons done
clear
C)
Both loses and gains electron done
clear
D)
Electron change takes place done
clear
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question_answer9)
\[2CuI\,\to Cu+Cu{{I}_{2}}\], the reaction is [RPMT 1997]
A)
Redox done
clear
B)
Neutralisation done
clear
C)
Oxidation done
clear
D)
Reduction done
clear
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question_answer10)
\[{{H}_{2}}S\] reacts with halogens, the halogens [JIPMER 2000]
A)
Form sulphur halides done
clear
B)
Are oxidised done
clear
C)
Are reduced done
clear
D)
None of these done
clear
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question_answer11)
\[{{H}_{2}}{{O}_{2}}\]reduces \[{{K}_{4}}Fe{{(CN)}_{6}}\] [MP PMT 1985]
A)
In neutral solution done
clear
B)
In acidic solution done
clear
C)
In non-polar solvent done
clear
D)
In alkaline solution done
clear
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question_answer12)
Max. number of moles of electrons taken up by one mole of \[NO_{3}^{-}\] when it is reduced to [DPMT 2002]
A)
\[N{{H}_{3}}\] done
clear
B)
\[N{{H}_{2}}OH\] done
clear
C)
\[NO\] done
clear
D)
\[N{{O}_{2}}\] done
clear
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question_answer13)
In the reaction \[3Mg+{{N}_{2}}\to M{{g}_{3}}{{N}_{2}}\] [MP PMT 1999]
A)
Magnesium is reduced done
clear
B)
Magnesium is oxidized done
clear
C)
Nitrogen is oxidized done
clear
D)
None of these done
clear
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question_answer14)
When sodium metal is dissolved in liquid ammonia, blue colour solution is formed. The blue colour is due to [NCERT 1981]
A)
Solvated \[N{{a}^{+}}\]ions done
clear
B)
Solvated electrons done
clear
C)
Solvated \[NH_{2}^{-}\] ions done
clear
D)
Solvated protons done
clear
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question_answer15)
Following reaction describes the rusting of iron \[4Fe+3{{O}_{2}}\,\to \,4F{{e}^{3+}}+6{{O}^{2-}}\] Which one of the following statement is incorrect [NCERT 1981; MNR 1991; AIIMS 1998]
A)
This is an example of a redox reaction done
clear
B)
Metallic iron is reduced to \[F{{e}^{3+}}\] done
clear
C)
\[F{{e}^{3+}}\] is an oxidising agent done
clear
D)
Metallic iron is a reducing agent done
clear
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question_answer16)
\[SnC{{l}_{2}}\]gives a precipitate with a solution of \[HgC{{l}_{2}}.\]In this process \[HgC{{l}_{2}}\]is [CPMT 1983]
A)
Reduced done
clear
B)
Oxidised done
clear
C)
Converted into a complex compound containing both \[Sn\] and \[Hg\] done
clear
D)
Converted into a chloro complex of \[Hg\] done
clear
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question_answer17)
Oxidation involves [NCERT 1971, 81; CPMT 1980, 82, 83; MP PMT 1983]
A)
Loss of electrons done
clear
B)
Gain of electrons done
clear
C)
Increase in the valency of negative part done
clear
D)
Decrease in the valency of positive part done
clear
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question_answer18)
Incorrect statement regarding rusting is [MP PET 2000]
A)
Metallic iron is oxidised to \[F{{e}^{3+}}\]ions done
clear
B)
Metallic iron is reduced to \[F{{e}^{2-}}\] ions done
clear
C)
Oxygen gas is reduced to oxide ion done
clear
D)
Yellowish ? brown product is formed done
clear
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question_answer19)
When copper turnings are added to silver nitrate solution, a blue coloured solution is formed after some time. It is because, copper [CPMT 1974, 79; DPMT 2000]
A)
Displaces silver from the solution done
clear
B)
Forms a blue coloured complex with \[AgN{{O}_{3}}\] done
clear
C)
Is oxidised to \[C{{u}^{2+}}\] done
clear
D)
Is reduced to \[C{{u}^{2+}}\] done
clear
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question_answer20)
Solution of sodium metal in liquid ammonia is strongly reducing due to the presence of the following in the solution [NCERT 1977; KCET (Med.) 2000]
A)
Sodium atoms done
clear
B)
Solvated electrons done
clear
C)
Sodium hydride done
clear
D)
Sodium amide done
clear
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question_answer21)
When \[S{{n}^{2+}}\]changes to \[S{{n}^{4+}}\]in a reaction [CPMT 1981]
A)
It loses two electrons done
clear
B)
It gains two electrons done
clear
C)
It loses two protons done
clear
D)
It gains two protons done
clear
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question_answer22)
Oxidation of thiosulphate \[2{{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O(l)\]ion by iodine gives [NCERT 1976]
A)
\[(mol.\,\,wt.\,=M)\] done
clear
B)
\[SO_{4}^{2-}\] done
clear
C)
\[{{S}_{4}}O_{6}^{2-}\] done
clear
D)
\[{{S}_{2}}O_{6}^{2-}\] done
clear
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question_answer23)
\[Z{{n}^{2+}}(aq)+2e\,\to \,Zn(s).\] This is [CPMT 1985]
A)
Oxidation done
clear
B)
Reduction done
clear
C)
Redox reaction done
clear
D)
None of these done
clear
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question_answer24)
One gas bleaches the colour of flowers by reduction while the other by oxidation [EAMCET 1980]
A)
\[CO\] and \[C{{l}_{2}}\] done
clear
B)
\[S{{O}_{2}}\] and \[C{{l}_{2}}\] done
clear
C)
\[{{H}_{2}}S\] and \[B{{r}_{2}}\] done
clear
D)
\[N{{H}_{3}}\] and \[S{{O}_{2}}\] done
clear
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question_answer25)
Reduction involves NCERT 1972]
A)
Loss of electrons done
clear
B)
Gain of electrons done
clear
C)
Increase in the valency of positive part done
clear
D)
Decrease in the valency of negative part done
clear
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question_answer26)
In a reaction between zinc and iodine, in which zinc iodide is formed, what is being oxidised [NCERT 1975]
A)
Zinc ions done
clear
B)
Iodide ions done
clear
C)
Zinc atom done
clear
D)
Iodine done
clear
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question_answer27)
Which one of the following reactions does not involve either oxidation or reduction [EAMCET 1982]
A)
\[VO_{2}^{+}\,\to \,{{V}_{2}}{{O}_{3}}\] done
clear
B)
\[Na\,\to \,N{{a}^{+}}\] done
clear
C)
\[CrO_{4}^{2-}\,\to \,C{{r}_{2}}O_{7}^{2-}\] done
clear
D)
\[Z{{n}^{2+}}\,\to \,Zn\] done
clear
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question_answer28)
In the following reaction, \[3B{{r}_{2}}+6CO_{3}^{2-}+3{{H}_{2}}O=5B{{r}^{-}}+BrO_{3}^{-}+6HC{{O}_{3}}\] [MP PMT 1994, 95]
A)
Bromine is oxidised and carbonate is reduced done
clear
B)
Bromine is reduced and water is oxidised done
clear
C)
Bromine is neither reduced nor oxidised done
clear
D)
Bromine is both reduced and oxidized done
clear
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question_answer29)
In the following reaction, \[4P+3KOH+3{{H}_{2}}O\to 3K{{H}_{2}}P{{O}_{2}}+P{{H}_{3}}\] [Pb. PMT 2002]
A)
P is oxidized as well as reduced done
clear
B)
P is reduced only done
clear
C)
P is oxidised only done
clear
D)
None of these done
clear
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question_answer30)
In the following reaction \[C{{r}_{2}}O_{7}^{-}+14{{H}^{+}}+6{{I}^{-}}\to \,\]\[2C{{r}^{3+}}+3{{H}_{2}}O+3{{I}_{2}}\] Which element is reduced [CPMT 1976]
A)
\[Cr\] done
clear
B)
\[H\] done
clear
C)
\[O\] done
clear
D)
\[I\] done
clear
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question_answer31)
The conversion of sugar \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\,\to \,\,C{{O}_{2}}\]is
A)
Oxidation done
clear
B)
Reduction done
clear
C)
Neither oxidation nor reduction done
clear
D)
Both oxidation and reduction done
clear
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question_answer32)
Which halide is not oxidised by \[Mn{{O}_{2}}\] [MNR 1985; JIPMER 2000]
A)
\[F\] done
clear
B)
\[Cl\] done
clear
C)
\[Br\] done
clear
D)
\[I\] done
clear
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question_answer33)
When \[F{{e}^{2+}}\] changes to \[F{{e}^{3+}}\] in a reaction
A)
It loses an electron done
clear
B)
It gains an electron done
clear
C)
It loses a proton done
clear
D)
It gains a proton done
clear
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question_answer34)
In acid solution, the reaction \[MnO_{4}^{-}\,\to \,M{{n}^{2+}}\] involves [MP PMT 1989]
A)
Oxidation by 3 electrons done
clear
B)
Reduction by 3 electrons done
clear
C)
Oxidation by 5 electrons done
clear
D)
Reduction by 5 electrons done
clear
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question_answer35)
When iron or zinc is added to \[CuS{{O}_{4}}\] solution, copper is precipitated. It is due to [CPMT 1974, 79]
A)
Oxidation of \[C{{u}^{+2}}\] done
clear
B)
Reduction of \[C{{u}^{+2}}\] done
clear
C)
Hydrolysis of \[CuS{{O}_{4}}\] done
clear
D)
Ionization of \[CuS{{O}_{4}}\] done
clear
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question_answer36)
In the reaction, \[4Fe+3{{O}_{2}}\to 4F{{e}^{3+}}+6{{O}^{2-}}\] which of the following statement is incorrect [UPSEAT 2001, 02]
A)
A Redox reaction done
clear
B)
Metallic iron is a reducing agent done
clear
C)
\[F{{e}^{3+}}\]is an oxidising agent done
clear
D)
Metallic iron is reduced to \[F{{e}^{3+}}\] done
clear
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question_answer37)
Which of the following is redox reaction [CBSE PMT 1997]
A)
\[{{H}_{2}}S{{O}_{4}}\] with \[NaOH\] done
clear
B)
In atmosphere, \[{{O}_{3}}\] from \[{{O}_{2}}\] by lightning done
clear
C)
Evaporation of \[{{H}_{2}}O\] done
clear
D)
Nitrogen oxides form nitrogen and oxygen by lightning done
clear
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