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EAMCET Medical EAMCET Medical Solved Paper-2006

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

    A)  \[-0.28\,V\]                                      

    B)  \[-0.34\,V\]

    C)  \[-0.82\,V\]                                      

    D)  \[-\text{ }0.22\,V\]

    Correct Answer: A

    Solution :

                     \[{{E}_{cell}}=E_{cell}^{o}-\frac{2.303RT}{nF}\log \left[ \frac{[Ni]}{[N{{i}^{2+}}]} \right]\] \[=-0.25-\frac{0.06}{2}\log \left( \frac{10}{0.1} \right)\] \[=-0.25-0.03\] \[{{E}_{cell}}=-0.28\,V\]


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