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NEET Chemistry NEET PYQ-Electrochemistry

  • question_answer
    If the \[{{E}^{o}}_{cell}\] for a given reaction has a negative value then which of the following gives the correct relationships for the values of \[\Delta {{G}^{o}}\] and \[{{K}_{eq}}\]? [AIPMT (S) 2011]

    A) \[\Delta {{G}^{o}}<\,0;\,{{K}_{eq}}>1\]

    B) \[\Delta {{G}^{o}}<\,0;\,{{K}_{eq}}<1\]

    C) \[\Delta {{G}^{o}}>\,0;\,{{K}_{eq}}<1\]

    D) \[\Delta {{G}^{o}}>\,0;\,{{K}_{eq}}>1\]

    Correct Answer: C

    Solution :

    [c] \[\Delta {{G}^{o}}=-nF{{E}^{o}}\]When \[{{E}^{o}}\] is negative, then \[\Delta {{E}^{o}}>0\]\[\Delta {{G}^{o}}=-RT\ln {{K}_{eq}}\]When  \[\Delta {{G}^{o}}>0,{{K}_{eq}}={{10}^{-x}}\]which is less, than one, ie,\[{{K}_{eq}}<1.\]


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