JEE Main & Advanced AIEEE Solved Paper-2004

  • 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 \[(F=96500\text{ }C\text{ }mo{{l}^{-1}})\]

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


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