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JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Question Bank Electrode potential Ecell Nernst equation and ECS

  • question_answer
    The standard potential at \[{{25}^{o}}C\] for the following half reactions are given against them \[Z{{n}^{2+}}+2e\to Zn,{{E}^{o}}=-0.762V\]\[M{{g}^{2+}}+2e\to Mg,{{E}^{o}}=-2.37V\] When zinc dust is added to the solution of \[MgC{{l}_{2}}\]  [UPSEAT 2001]

    A)                 \[ZnC{{l}_{2}}\]is formed

    B)                 Zinc dissolves in the solution

    C)                 No reaction takes place

    D)                 \[Mg\]is precipitated

    Correct Answer: C

    Solution :

               \[\overset{\,\,\,\,0}{\mathop{Zn}}\,+\overset{+2\,\,\,}{\mathop{MgC{{l}_{2}}}}\,\,\,\,\,\,\,\,\,\to \overset{+2\,\,\,\,\,}{\mathop{\,\,\,\,\,\,ZnC{{l}_{2}}}}\,+Mg\] No reaction            This type of reaction does not occur because                                 \[M{{g}^{2+}}{{E}^{o}}=-2.37V\] while \[Z{{n}^{2+}}{{E}^{o}}=-0.76V\].


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