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

  • question_answer
    A variable, opposite external potential \[({{E}_{ext}})\] is applied to the cell \[Zn|Z{{n}^{2+}}(1M)||C{{u}^{2+}}(1\,M)|Cu,\] of potential 1.1 V. When \[{{E}_{ext}}<1.1V\] and \[{{E}_{ext}}>1.1V\], respectively electrons flow from:

    A) anode to cathode in both cases

    B) cathode to anode and anode to cathode

    C) anode to cathode and cathode to anode

    D) cathode to anode in both cases

    Correct Answer: C

    Solution :

    [c] EMF of galvanic cell =1.1 volt If \[{{E}_{ext}}<EMF\] then electron flows steadily from anode to cathode while If \[{{E}_{ext}}>EMF\] then electron flows from cathode to anode as polarity is changed.


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