AIIMS AIIMS Solved Paper-2007

  • question_answer
    The standard emf of a galvanic cell involving cell reaction with n = 2 found to be 0.295 V at \[{{25}^{o}}C\]. The equilibrium constant of the reaction would be

    A)  \[2\times {{10}^{11}}\]                                

    B)  \[4\times {{10}^{12}}\]

    C)         \[1\times {{10}^{2}}\]                  

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

    Correct Answer: D

    Solution :

    \[E_{cell}^{o}=\frac{2.303RT}{nF}\log {{K}_{eq}}\] \[0.295=\frac{2.303\times 8.314\times 298}{2\times 96500}\log {{K}_{eq}}\] \[\log {{K}_{eq}}=\frac{2.303\times 96500\times 0.295}{2.303\times 8.314\times 298}\] \[=10\] \[{{\text{K}}_{\text{eq}}}\text{=antilog10}\] \[=1\times {{10}^{10}}\]


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