Assertion :The voltage of mercury cell remains constant for its life time. Reason: Overall cell reaction does not involve any ion.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The voltage remains same because the number of ions consumed at anode get librated out at cathode, so total concentration remains same;
and the net reaction does not involve any ion.
$Z n$ + $H g O$ $\to$ $Z n O$ + $H g$

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