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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2003

  • question_answer
    A galvanic cell is constructed using the redox reaction, \[\frac{1}{2}{{H}_{2}}(g)+AgCl(s){{H}^{+}}(aq)+C{{l}^{-}}\]\[(aq)+Ag(s)\]it is represented as :

    A) \[Pt|{{H}_{2}}(g)|HCl(sol.n)|l\,AgN{{O}_{3}}(sol.n)|Ag\]

    B)  \[Ag|AgCl(s)|KCl(sol.n)|l\,HCl(sol.n)\]\[,\,{{H}_{2}}(g)|Pt\]

    C)  \[Pt|{{H}_{2}}(g)|KCl(sol.n)|l\,AgCl(s)\,l\,Ag\]

    D)  \[Pt|{{H}_{2}}(g)|HCl(sol.n)|l\,AgCl(s)\,l\,Ag\]

    Correct Answer: D

    Solution :

    The cell reaction is : \[\frac{1}{2}{{H}_{2}}(g)+AgCl(s)\]\[{{H}^{+}}(aq)\]\[+C{{l}^{-}}(aq)+Ag(s)\] Obviously, here hydrogen is being oxidised and \[AgCl\] is getting reduced. Hence the correct cell representation will be: \[Pt|{{H}_{2}}(g),\,HCl\] (solution) \[|\,\,|\,AgCl(s)|Ag\]


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