Assertion:In mercury cell, the cell potential is approximately 1.35 V Which cell will measure standard electrode and remains constant during its life.
Reason : The overall reaction in mercury cell is represented as `Zn(Hg)+HgO_((s)) to ZnO_((s)) + Hg_((l))`
A. If both assertion and reason are true and reason is the correct explanation of assertion .
B. If both assertion and reason are true but reason is not the correct explanation of assertion .
C. If assertion is true but reason is false .
D. If both assertion and reason are false .

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Correct Answer - A
Overall reaction does not involve any ion in solution whose concentration can change during its life time .

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