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

  • question_answer
    The standard oxidation potential of zinc and silver in water at \[298\,\,K\]are                 \[Zn\,\,(s)\,\,\to \,\,Z{{n}^{2+}}+2{{e}^{-}}\,;\,E=0.76\,V\]                 \[Ag\,\,(s)\,\,\to \,A{{g}^{2+}}+2{{e}^{-}}\,;\,E=-0.80\,V\]                 Which of the following reactions actually take place                 [NCERT 1983, 84; KCET 2003]

    A)                 \[Zn(s)+2A{{g}^{+}}(aq)\,\to \,Z{{n}^{++}}(aq)+2Ag(s)\]

    B)                 \[Z{{n}^{++}}(aq)+2Ag(s)\,\to \,2A{{g}^{+}}(aq)+Zn(s)\]

    C)                 \[Zn(s)+Ag(s)\,\to \,Z{{n}^{++}}(aq)+A{{g}^{+}}(aq)\]

    D)                 \[Z{{n}^{++}}(aq)+A{{g}^{+}}(aq)\,\to \,Zn(s)+Ag(s)\]

    Correct Answer: A

    Solution :

               \[\overset{o}{\mathop{Z{{n}_{(s)}}}}\,+2Ag_{(aq)}^{+}\to Zn_{(aq)}^{2+}+\overset{o}{\mathop{2A{{g}_{(s)}}}}\,\]                                 In this reaction zinc act as a anode and \[Ag\] act as a cathode.


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