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

  • question_answer
    The reduction potential (in volt) of a hydrogen electrode set up with a \[2\times {{10}^{-2}}M\] aqueous solution of a weak mono basic acid \[({{K}_{a}}=5\times {{10}^{-5}})\] at one atmosphere and \[25{}^\circ C\] is

    A) +0.09              

    B) +0.18

    C) \[-0.09\]            

    D) \[-0.18\]

    Correct Answer: D

    Solution :

    [d] \[2{{H}^{+}}+2{{e}^{-}}\xrightarrow{{}}{{H}_{2}}\] \[{{E}_{cell}}=0.06\,log[{{H}^{+}}]=0.06\times log\sqrt{{{K}_{a}}C}\] \[=0.06\times log{{10}^{-3}}=-0.18V\]


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