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JCECE Engineering JCECE Engineering Solved Paper-2011

  • question_answer
    Which one of the following will increase the voltage of the cell? \[Sn(s)+2A{{g}^{+}}(aq)\xrightarrow{{}}S{{n}^{2+}}+(aq)+2Ag(s)\]

    A)  Increase in the size of silver rod

    B)  Increasing the size of plate

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

    D)  Increase in the concentration of \[S{{n}^{2+}}\] ions

    Correct Answer: C

    Solution :

    \[{{E}_{cell}}=E_{cell}^{o}-\frac{0.0591}{2}\log \frac{[S{{n}^{2+}}]}{{{[A{{g}^{+}}]}^{2}}}\] Increase in the \[[A{{g}^{+}}]\] will decrease the logarithmic factor and hence, increase the\[{{E}_{cell}}.\]


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