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KVPY Sample Paper KVPY Stream-SX Model Paper-16

  • question_answer
    If the standard electrode potential for a cell is V at 300 K, the equilibrium constant (K) for the reaction \[Zn(s)+C{{u}^{2+}}(aq)Z{{n}^{2+}}(aq)+Cu(s)\] At 300 K is approximately \[(R=8j{{K}^{-\,1}}mo{{l}^{-\,1}},F=96000Cmo{{l}^{-1}})\]

    A) \[{{e}^{-\,80}}\]

    B) \[{{e}^{-\,160}}\]

    C) \[{{e}^{320}}\]

    D) \[{{e}^{160}}\]

    Correct Answer: D

    Solution :

    \[Zn(s)+C{{u}^{2+}}(aq)Z{{n}^{2+}}(aq)+Cu\,(s)\]\[-nF{{E}_{cell}}=-RT\ell K\] \[\ell nK=\frac{2\times 96500\times 2}{8\times 300}\] = 160.83 \[K={{e}^{160}}.\]


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