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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2008

  • question_answer
    What is the electrode potential (in\[V\]) of the following electrode at\[{{25}^{o}}C\]?                 \[N{{i}^{2+}}(0.1\,\,M)|Ni(s)\] (Standard reaction potential of \[N{{i}^{2+}}|Ni\] is \[-0.25\,\,V,\,\,\frac{2.303RT}{F}=0.06)\]

    A) \[-0.28\,\,V\]                    

    B)        \[-0.34\,\,V\]

    C)        \[-0.82\,\,V\]                    

    D)        \[-0.22\,\,V\]

    Correct Answer: A

    Solution :

    \[E_{cell}^{o}=E_{cell}^{o}-\frac{2.303RT}{nF}\log \left[ \frac{[Ni]}{[N{{i}^{2+}}]} \right]\]                 \[=-0.25-\frac{0.06}{2}\log \left( \frac{1}{0.1} \right)\]      \[(\because \,\,n=2)\]                 \[=-0.25-0.03\times 1\]       \[{{E}_{cell}}=-0.28\,\,V\]


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