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CMC Medical CMC-Medical VELLORE Solved Paper-2014

  • question_answer
    \[MnO_{4}^{-}+8{{H}^{+}}+5{{e}^{-}}\xrightarrow[{}]{{}}M{{n}^{2+}}+4{{H}_{2}}O;\]\[E{}^\circ =1.51\,\,V\] \[Mn{{O}_{2}}+4{{H}^{+}}+2{{e}^{-}}\xrightarrow[{}]{{}}M{{n}^{2+}}+2{{H}_{2}}O;\]\[E{}^\circ =1.23\,\,V\]

    A)  1.70 V                  

    B)  0.91 V

    C)  1.37 V                  

    D)  0.548 V

    Correct Answer: A

    Solution :

              For the reaction, \[MnO_{4}^{-}+4{{H}^{+}}+3{{e}^{-}}\xrightarrow{{}}Mn{{O}_{2}}+2{{H}_{2}}O\] \[-{{E}_{3}}=\frac{-1.51\times 5+2\times 1.23}{3}\] \[\therefore \]  \[{{E}_{3}}=1.70\,V\]


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