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

  • question_answer
    For the reduction of silver ions with copper metal, the standard cell potential was found to be \[+0.46\text{ }V\] at \[25{}^\circ C.\] The value of standard Gibbs energy, \[\Delta G{}^\circ \] will be \[\left( F=96500C\text{ }mo{{l}^{-1}} \right)\]

    A) \[-89.0\,kJ\]                   

    B) \[-89.0\,J\]

    C) \[-44.5\,kJ\]                   

    D) \[-98.0\,kJ\]

    Correct Answer: A

    Solution :

    [a] \[Cu+2A{{g}^{+}}(aq)\xrightarrow{{}}C{{u}^{2+}}(aq)+2Ag(s)\] Here \[n=2,E_{cell}^{{}^\circ }=+0.46V\] \[\Delta G{}^\circ =-nE{}^\circ F\] \[=\frac{-2\times 0.46\times 96500}{1000}kJ\simeq -89kJ\]


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