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VIT Engineering VIT Engineering Solved Paper-2011

  • question_answer
    The EMF of the cell, \[Mg|M{{g}^{2+}}(0.01M)||S{{n}^{2+}}(0.1M)|Sn\]at  298 K is \[(E_{M{{g}^{2+}}/Mg}^{o}=-2.34V,\,E_{S{{n}^{2+}}/Sn}^{o}=-0.14V)\]

    A)  \[2.17V\]

    B)  \[2.23V\]

    C)  \[2.51V\]

    D)  \[2.45V\]

    Correct Answer: B

    Solution :

     \[Mg+S{{n}^{2+}}\xrightarrow{{}}M{{g}^{2+}}+Sn\] \[{{E}_{cell}}=E_{cell}^{o}-\frac{0.0591}{2}\log \frac{[M{{g}^{2+}}]}{[S{{n}^{2+}}]}\] \[=(2.34-0.14)-\frac{0.0591}{2}\log \frac{{{10}^{-2}}}{{{10}^{-1}}}\] \[=2.23V\]


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