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NEET Chemistry Electrochemistry / विद्युत् रसायन Question Bank Self Evaluation Test - Electrochemistry

  • question_answer
    The emf of a particular voltaic cell with the cell reaction \[Hg_{2}^{2+}+{{H}_{2}}\rightleftharpoons 2Hg+2{{H}^{+}}\] is 0.65 V. The maximum electrical work of this cell when 0.5 g of \[{{H}_{2}}\] is consumed.

    A) \[-3.12\times {{10}^{4}}J\]      

    B) \[-1.25\times {{10}^{5}}J\]

    C) \[25.0\times {{10}^{6}}J\]       

    D) None of these

    Correct Answer: A

    Solution :

    [a] \[{{W}_{max}}=-n.FE;\] \[{{W}_{max}}=-2\times 96500\times 0.65=-1.25\times {{10}^{5}}J\] \[0.5g\,{{H}_{2}}=0.25mole\] Hence \[{{W}_{max}}\] \[=-1.25\times {{10}^{5}}\times 0.25=-3.12\times {{10}^{4}}J\]


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