JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2007

  • question_answer
        The standard emf of a cell, involving one electron change is found to be 0.591 V at\[25{}^\circ C\]. The equilibrium constant of the reaction is \[(F=96,500\text{ }C\text{ }mo{{l}^{-1}})\]

    A)  \[1.0\times {{10}^{1}}\]               

    B)  \[1.0\times {{10}^{5}}\]

    C)  \[1.0\times {{10}^{10}}\]            

    D) \[1.0\times {{10}^{30}}\]

    Correct Answer: C

    Solution :

                    Relation between\[{{K}_{eq}}\]and\[{{E}_{cell}}\]is \[E_{cell}^{o}=\frac{2.303RT}{nF}{{\log }_{eq}}\] \[E_{cell}^{o}=\frac{0.0591}{n}\log {{K}_{eq}}\]                 \[(at\,298\,K)\] \[0.591=\frac{0.0591}{1}\log {{K}_{eq}}\] \[\therefore \]  \[\log {{K}_{eq}}=10\] \[\therefore \]  \[{{K}_{eq}}=1\times {{10}^{10}}\]


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