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WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    The   cell   reaction   of   a   cell   is \[Mg(s)+C{{u}^{2+}}(aq)\xrightarrow{{}}Cu(s)+M{{g}^{2+}}(aq).\]If the standard reduction potentials of Mg and Cu are \[-\text{ }2.37\] and \[+\text{ }0.34\,V\] respectively. The emf of the cell is

    A)  \[2.03V\]                           

    B)  \[-2.03V\]

    C)  \[+2.71V\]                         

    D)  \[-2.71V\]

    Correct Answer: C

    Solution :

                     \[Mg\to M{{g}^{2+}}+2{{e}^{-}}\]                             (at anode) \[C{{u}^{2+}}+2{{e}^{-}}\to Cu\]                                (at cathode) \[{{E}_{cell}}=E_{cathode}^{o}-E_{anode}^{o}\] \[=+0.34-(-2.37)\] \[=+2.71\,V\]


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