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

done Redox reaction and Method for balancing redox reaction Total Questions - 15

• question_answer1)
  The value of \[x\] in the partial redox equation \[MnO_{4}^{-}+8{{H}^{+}}+xe\] ⇌\[M{{n}^{2+}}+4{{H}_{2}}O\] is
  A)
                  5              done clear
  B)
                  3                                       done clear
  C)
                  1              done clear
  D)
                  0 done clear
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• question_answer2)
  \[{{C}_{2}}{{H}_{6}}(g)+n{{O}_{2}}\,\to \,C{{O}_{2}}\,(g)+{{H}_{2}}O\,(l)\] In this equation, the ratio of the coefficients of \[C{{O}_{2}}\]and \[{{H}_{2}}O\] is           [KCET 1992]
  A)
                  1 : 1        done clear
  B)
                  2 : 3 done clear
  C)
                  3 : 2        done clear
  D)
                  1 : 3 done clear
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• question_answer3)
  The number of electrons involved in the reduction of \[C{{r}_{2}}O_{7}^{2-}\]in acidic solution to \[C{{r}^{3+}}\]is                [EAMCET 1983]
  A)
                  0              done clear
  B)
                  2 done clear
  C)
                  3              done clear
  D)
                  5 done clear
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• question_answer4)
  When \[KMn{{O}_{4}}\] acts as an oxidising agent and ultimately forms \[{{[\,Mn{{O}_{4}}]}^{-2}},\,\,Mn{{O}_{2}},\,\,\,M{{n}_{2}}{{O}_{3}},\,\,M{{n}^{+2}}\]  then the number of electrons transferred in each case respectively is                 [AIEEE 2002]
  A)
                  4, 3, 1, 5                done clear
  B)
                  1, 5, 3, 7 done clear
  C)
                  1, 3, 4, 5                done clear
  D)
                  3, 5, 7, 1 done clear
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• question_answer5)
  Starch paper is used to test for the presence of [NCERT 1979]
  A)
                  Iodine   done clear
  B)
                  Oxidising agent done clear
  C)
                  Iodide ion            done clear
  D)
                  Reducing agent done clear
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• question_answer6)
  How many moles of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] can be reduced by 1 mole of \[S{{n}^{2+}}\]                      [MP PMT 2003]
  A)
                  1/3         done clear
  B)
                  1/6 done clear
  C)
                  2/3         done clear
  D)
                  1 done clear
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• question_answer7)
  \[2MnO_{4}^{-}+5{{H}_{2}}{{O}_{2}}+6{{H}^{+}}\to 2\,\,Z+5{{O}_{2}}+8{{H}_{2}}O\]. In this reaction Z is               [RPMT 2002]
  A)
                  \[M{{n}^{+2}}\]                done clear
  B)
                  \[M{{n}^{+4}}\] done clear
  C)
                  \[Mn{{O}_{2}}^{{}}\]      done clear
  D)
                  \[Mn\] done clear
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• question_answer8)
  What is ?A? in the following reaction \[2F{{e}^{3+}}_{(aq)}+S{{n}^{2+}}_{(aq)}\to 2F{{e}^{2+}}_{(aq)}+A\]             [MP PET 2003]
  A)
                  \[S{{n}^{3+}}_{(aq)}\]    done clear
  B)
                  \[S{{n}^{4+}}_{(aq)}\] done clear
  C)
                  \[S{{n}^{2+}}_{(aq)}\]    done clear
  D)
                  Sn done clear
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• question_answer9)
  For the redox reaction \[MnO_{4}^{-}+{{C}_{2}}O_{4}^{-2}+{{H}^{+}}\to \,M{{n}^{2+}}+C{{O}_{2}}+{{H}_{2}}O\] the correct coefficients of the reactants for the balanced reaction are    [IIT 1988, 92; BHU 1995; CPMT 1997; RPMT 1999; DCE 2000; MP PET 2003]
  A)
                  \[MnO_{4}^{-}\]                              \[{{C}_{2}}O_{4}^{2-}\]                 \[{{H}^{+}}\]                  2                             5                              16 done clear
  B)
                  16                           5                              2 done clear
  C)
                  5                              16                           2 done clear
  D)
                  2                              16                           5 done clear
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• question_answer10)
  Which of the following is a redox reaction                                                                 [AIEEE 2002]
  A)
                  \[NaCl+KN{{O}_{3}}\to NaN{{O}_{3}}+KCl\] done clear
  B)
                  \[Ca{{C}_{2}}{{O}_{4}}+2HCl\to CaC{{l}_{2}}+{{H}_{2}}{{C}_{2}}{{O}_{4}}\] done clear
  C)
                  \[Mg{{(OH)}_{2}}+2N{{H}_{4}}Cl\to MgC{{l}_{2}}+2N{{H}_{4}}OH\] done clear
  D)
                  \[Zn+2AgCN\to 2Ag+Zn{{(CN)}_{2}}\] done clear
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• question_answer11)
  Which of the following reaction is a redox reaction           [MP PMT 2003]
  A)
                  \[{{P}_{2}}{{O}_{5}}+2{{H}_{2}}O\to {{H}_{4}}{{P}_{2}}{{O}_{7}}\]             done clear
  B)
                  \[2AgN{{O}_{3}}+BaC{{l}_{2}}\to 2AgCl+Ba{{(N{{O}_{3}})}_{2}}\] done clear
  C)
                  \[BaC{{l}_{2}}+{{H}_{2}}S{{O}_{4}}\to BaS{{O}_{4}}+2HCl\] done clear
  D)
                  \[Cu+2AgN{{O}_{3}}\to 2Ag+Cu{{(N{{O}_{3}})}_{2}}\] done clear
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• question_answer12)
  Which of the following reactions involves oxidation-reduction [NCERT 1972; AFMC 2000; Pb. CET 2004; CPMT 2004]
  A)
                  \[NaBr+HCl\,\to \,NaCl+HBr\] done clear
  B)
                  \[HBr+AgN{{O}_{3}}\,\to \,AgBr+HN{{O}_{3}}\] done clear
  C)
                  \[{{H}_{2}}+B{{r}_{2}}\,\to \,2HBr\] done clear
  D)
                  \[2NaOH+{{H}_{2}}S{{O}_{4}}\,\to \,N{{a}_{2}}S{{O}_{4}}+2{{H}_{2}}O\] done clear
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• question_answer13)
  Which of the following is the strongest oxidising agent [Pb. CET 2000]
  A)
                  \[BrO_{3}^{-}/B{{r}^{2+}},\,{{E}^{o}}=+1.50\] done clear
  B)
                  \[F{{e}^{3+}}/F{{e}^{2+}},\,{{E}^{o}}=+0.76\] done clear
  C)
                  \[MnO_{4}^{-}/M{{n}^{2+}},\,{{E}^{o}}=+1.52\] done clear
  D)
                  \[C{{r}_{2}}O_{7}^{2-}/C{{r}^{3+}},\,{{E}^{o}}=+1.33\] done clear
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• question_answer14)
  In the balanced chemical reaction,                 \[IO_{3}^{-}+a\ {{I}^{-}}+b\ {{H}^{+}}\to c\ {{H}_{2}}O+d\ {{I}_{2}}\] a, b, c and d respectively correspond to [AIIMS 2005]
  A)
                  5, 6, 3, 3                done clear
  B)
                  5, 3, 6, 3 done clear
  C)
                  3, 5, 3, 6                done clear
  D)
                  5, 6, 5, 5 done clear
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• question_answer15)
  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
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