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JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Question Bank Critical Thinking Electrochemistry

  • question_answer
    The standard \[EMF\] for the given cell reaction \[Zn+C{{u}^{2+}}=Cu+Z{{n}^{2+}}\] is \[1.10V\] at \[{{25}^{o}}C\]. The \[EMF\] for the cell reaction, when \[0.1M\,C{{u}^{2+}}\] and \[0.1M\,Z{{n}^{2+}}\] solutions are used, at \[{{25}^{o}}C\] is [MNR 1994; AMU 1999; UPSEAT 2002]

    A)                 \[1.10\,V\]         

    B)                 \[0.110\,V\]

    C)                 \[-1.10\,V\]       

    D)                 \[-\,0.110\,V\]

    Correct Answer: A

    Solution :

               \[{{E}_{cell}}=E_{cell}^{o}-\frac{0.059}{2}\,\,\log \frac{(Z{{n}^{++}})}{(C{{u}^{++}})}\]                                 \[=1.10-\frac{0.059}{2}\,\,\log \frac{0.1}{0.1}=1.10\,\,V\].


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