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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2009

  • question_answer
        For the redox reaction,\[MnO_{4}^{-}+{{C}_{2}}O_{4}^{2-}+{{H}^{+}}\xrightarrow[{}]{{}}M{{n}^{2+}}+C{{O}_{2}}+{{H}_{2}}O\]the correct coefficient of the reactants for the balanced reaction are                 \[MnO_{4}^{-}\]                              \[{{C}_{2}}O_{4}^{2-}\]                 \[{{H}^{+}}\]

    A)                 2                              5                              16

    B)                 16                           5                              2

    C)                 5                              16                           2

    D)                 2                              16                           5

    Correct Answer: A

    Solution :

                    Oxidation reaction\[{{C}_{2}}O_{4}^{2-}\xrightarrow[{}]{{}}2C{{O}_{2}}+2{{e}^{-}}]\times 5\] Reduction reaction \[MnO_{4}^{-}+8{{H}^{+}}+5{{e}^{-}}\xrightarrow[{}]{{}}M{{n}^{2+}}+8{{H}_{2}}O]\times 2\] Net reaction \[=2MnO_{4}^{-}+16{{H}^{+}}+5{{C}_{2}}O_{4}^{2-}\xrightarrow[{}]{{}}2M{{n}^{2+}}\]\[+10C{{O}_{2}}+8{{H}_{2}}O\]


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