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JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Question Bank Cell constant and Electrochemical cells

  • question_answer
    If the \[Z{{n}^{2+}}/Zn\] electrode is diluted to 100 times then the change in e.m.f.         [DPMT 2005]

    A)                 Increase of \[59\,mV\]

    B)                 Decrease of \[59\,mV\]

    C)                 Increase of \[29.5\,mV\]

    D)                 Decrease of \[29.5\,mV\]

    Correct Answer: A

    Solution :

               \[{{E}_{cell}}=\frac{0.059}{n}\log \frac{1}{C}=-\frac{0.059}{2}\log \frac{1}{100}\]                                 \[=-\frac{0.059}{2}(-2)=0.059V=59mV\]. (increase)


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