Assertion: The cell potential of mercury cell is 1.35V, which remains constant.
Reason: In mercury cell, the electrolyte is a paste of KOH and ZnO.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(e) If the Assertion is incorrect but the Reason is correct.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
Explanation:
Zn(l) + HgO (s) → Zn(s) + Hg (l)
The cell potential remains constant during its life as the overall reaction does not involve any ion in solution whose concentration changes during its life time.