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JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Question Bank Mock Test - Electrochemistry

  • question_answer
    The overall cell reaction of Daniell cell is: \[Zn(s)+C{{u}^{2+}}\rightleftharpoons Z{{n}^{2+}}+Cu(s);\] \[E{}^\circ =+\,1.10\text{ }V\] \[Q=\frac{[Z{{n}^{2+}}]}{[C{{u}^{2+}}]}\] When \[{{\log }_{10}}\]Q is plotted on X-axis and \[{{E}_{cell}}\] on Y-axis, then which of the following will correctly represent the variation?

    A)

    B)

    C)

    D)

    Correct Answer: B

    Solution :

    [b] When log \[Q=0,E={{E}^{0}}=1.10V\] The value of cell potential \[({{E}_{cell}})\]will decrease with increase in the value of \[{{\log }_{10}}\]Q; as indicated by the Nernst equation\[E={{E}^{o}}-\frac{0.059}{n}{{\log }_{10}}Q\]


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