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MGIMS WARDHA MGIMS WARDHA Solved Paper-2015

  • question_answer
    Which one of the following conditions will increase the voltage of the cell represents by the equation? \[Cu(s)+2A{{g}^{+}}(aq)\xrightarrow[{}]{{}}C{{u}^{2+}}(aq)+Ag(s)\]

    A)  Increase in the concentration of\[A{{g}^{+}}\]ions

    B)  Increase in the concentration of\[C{{u}^{2+}}\]ions

    C)  Increase in the dimensions of silver electrode

    D)  Increase in the dimensions of copper electrode

    Correct Answer: A

    Solution :

                    From Nemst equation \[{{E}_{cell}}=E_{cell}^{o}-\frac{0.0591}{n}\log \frac{[C{{u}^{2+}}]}{{{[A{{g}^{+}}]}^{2}}}\] Increase in concentration of \[{{[A{{g}^{+}}]}^{2}}\] will decrease the value of logarithmic term and hence increase cell.


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