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J & K CET Engineering J and K - CET Engineering Solved Paper-2008

  • question_answer
    During a redox titration involving a solution containing \[\text{F}{{\text{e}}^{\text{2+}}}\]ions against\[\text{MnO}_{4}^{-}\]in the presence of excess of \[{{\text{H}}^{\text{+}}}\]ions, the number of electrons that gets transferred is.

    A)  6               

    B)  5

    C)  4           

    D)  2

    Correct Answer: B

    Solution :

     \[\underline{\begin{align}   & \underline{\begin{align}   & MnO_{4}^{-}+8{{H}^{+}}+5{{e}^{-}}\xrightarrow{{}}M{{n}^{2+}}+4{{H}_{2}}O \\  & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,[F{{e}^{2+}}\xrightarrow{{}}F{{e}^{3+}}+{{e}^{-}}]\,5\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\ \end{align}} \\  & MnO_{4}^{-}+8{{H}^{+}}+5F{{e}^{2+}}\to M{{n}^{2+}}+5F{{e}^{3+}}+4{{H}_{2}}O \\ \end{align}}\] \[\therefore \]Five electrons gets transferred.


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