JEE Main & Advanced Chemistry Redox Reactions / रेडॉक्स अभिक्रियाएँ Question Bank

done Oxidation Reduction Total Questions - 37

• 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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