Punjab Medical Punjab - MET Solved Paper-2009

  • question_answer
    \[E{}^\circ \]for\[M{{g}^{2+}}/Mg=-2.37\,\,V,\,\,Z{{n}^{2+}}/Zn=-0.76\,V\]and\[F{{e}^{2+}}/Fe=-0.44\,\,V\]. Which statement is correct?

    A)  \[Zn\]reduce\[F{{e}^{2+}}\]     

    B)  \[Zn\]reduces\[M{{g}^{2+}}\]

    C)  \[Mg\]oxidises Fe          

    D)  \[Zn\]oxidises\[Fe\]

    Correct Answer: A

    Solution :

    Higher the negative value of reduction potential, higher will be the reducing power. Hence, \[Mg\]reduces both\[Z{{n}^{2+}}\]and\[F{{e}^{2+}}\].\[Zn\]can reduce \[F{{e}^{2+}}\] but not \[M{{g}^{2+}}\]. Similarly \[F{{e}^{2+}}\] can oxidise\[Zn\]and\[Mg\]both.


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