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EAMCET Medical EAMCET Medical Solved Paper-2009

  • question_answer
    The standard potentials, at \[\text{25}{{\,}^{\text{o}}}\text{C,}\] for the half- reactions are given against them below : \[Z{{n}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Zn\]       \[{{E}^{o}}=-0.762\,V\] \[M{{g}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Mg\]   \[{{E}^{o}}=-2.37\,V\] When Zn dust is added to a solution of \[\text{MgC}{{\text{l}}_{\text{2}}}\text{,}\]

    A)  magnesium is precipitated

    B)  zinc dissolves in the solution

    C)  zinc chloride is formed

    D)  no reaction takes place

    Correct Answer: D

    Solution :

                     Since, the standard reduction potential of Zn is higher than that of Mg. So, it is placed after Mg  in the electrochemical series. Therefore, it cannot replace Mg from \[\text{MgC}{{\text{l}}_{\text{2}}}\text{.}\]


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