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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2011

  • question_answer
    For the \[Zn-Cu\] cell,\[{{E}^{o}}=1.10\,\,V.\] If the reduction potential  of \[C{{u}^{2+}}(aq)|Cu(s)\] couple is \[0.34\,\,V\], then the reduction potential of \[Z{{n}^{2+}}(aq)|Zn(s)\] couple will be

    A) \[-0.76\,\,V\]                    

    B) \[0.76\,\,V\]

    C) \[7.6\,\,V\]                                     

    D) \[0.38\,\,V\]

    Correct Answer: A

    Solution :

    The cell represented as                 \[Zn(s)|Z{{n}^{2+}}(aq)||C{{u}^{2+}}(aq)|Cu(s)\]                 \[E_{cell}^{\text{o}}=E_{cathode(RP)}^{\text{o}}-E_{anode(RP)}^{\text{o}}\]                 \[=0.34-1.10\]                 \[=-0.76\,\,V\]


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