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JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Question Bank Electrode potential Ecell Nernst equation and ECS

  • question_answer
    For a cell reaction involving a two-electron change, the standard emf of the cell is found to be 0.295 V at \[{{25}^{o}}C\]. The equilibrium constant of the reaction at \[{{25}^{o}}C\] will be             [Roorkee 1999; AIEEE 2003; CBSE PMT 2004]

    A)                 \[1\times {{10}^{-10}}\]

    B)                 \[29.5\times {{10}^{-2}}\]

    C)                 10          

    D)                 \[1\times {{10}^{10}}\]

    Correct Answer: D

    Solution :

               \[\Delta G=-nF{{E}^{o}}\]            \[\Delta G=-2.303RT\,\log \,K\]; \[nF{{E}^{o}}=2.303RT\,\log \,K\]            \[\log K=\frac{nF{{E}^{o}}}{2.303RT}=\frac{2\times 96500\times 0.295}{2.303\times 8.314\times 298}\]                                 \[\log K=9.97=K=1\times {{10}^{10}}\].


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