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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2011

  • question_answer
    \[{{E}_{1}},{{E}_{2}}\] and \[{{E}_{3}}\] are the emfs of the following three galvanic cells respectively. [a] \[Zn(s)|Z{{n}^{2+}}(0.1M)||C{{u}^{2+}}(1M)|Cu(s)\] [b] \[Zn(s)|Z{{n}^{2+}}(1M)||C{{u}^{2+}}(1M)|Cu(s)\] [c] \[Zn(s)|Z{{n}^{2+}}(1M)||C{{u}^{2+}}(0.1M)|Cu(s)\] Which one of the following is true?

    A)  \[{{E}_{2}}>{{E}_{1}}>{{E}_{3}}\]

    B)  \[{{E}_{1}}>{{E}_{2}}>{{E}_{3}}\]

    C)  \[{{E}_{3}}>{{E}_{1}}>{{E}_{2}}\]

    D)  \[{{E}_{3}}>{{E}_{2}}>{{E}_{1}}\]

    Correct Answer: B

    Solution :

    \[E={{E}^{o}}+\frac{0.059}{2}\log \frac{[C{{u}^{2+}}]}{[Z{{n}^{2+}}]}\] \[\therefore \] \[{{E}_{1}}>{{E}_{2}}>{{E}_{3}}\]


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