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Question

An electrochemical cell stops working after sometime because:-

A
Electrode potential of both the electrodes becomes zero
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B
Electrode potential of both the electrodes becomes equal
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C
The reaction starts proceeding in opposite direction
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D
None of these
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Solution

The correct option is B Electrode potential of both the electrodes becomes equal

Oxidation happens at the anode and reduction at the cathode due to a potential difference between the two electrodes. As the reaction proceeds, these potentials come close to each other until they become equal. When this happens, no more electrons flow - as current exists only when there is a potential difference. This is when the cell stops working.

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