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AMU Medical AMU Solved Paper-2011

  • question_answer
    The standard potentials at room temperature for the two half cells are given \[Z{{n}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Zn,\,\,{{E}^{o}}=-0.762\,V\] \[M{{g}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Mg,\text{ }\,\,E{}^\circ =-\text{ }2.37\,V\] When Zn metal is added to a solution of \[MgC{{l}_{2}}\]

    A)  \[ZnC{{l}_{2}}\] is formed

    B)  Mg is precipitated

    C)  Zn dissolves in the solution

    D)  no reaction takes place

    Correct Answer: D

    Solution :

                     A redox reaction is feasible only if the species which has higher reduction potential is reduced. The reduction potential of Mg is lower than zinc hence when Zn metal is added to a solution of \[MgC{{l}_{2}}\] no reaction takes place. \[Zn+MgC{{l}_{2}}\xrightarrow{{}}\] no reaction takes place.


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