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  4. Assertion (A) Mercury cells give a constant voltage throughout its life. Reason (R) Electrolyte KOH is not involved in the reaction.

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Q. Assertion (A) Mercury cells give a constant voltage throughout its life.
Reason (R) Electrolyte $KOH$ is not involved in the reaction.

Electrochemistry

Solution:

Mercury cell gives the constant voltage throughout its life because the overall reaction does not involve any ion in the solution, concentration of which charges during its whole life.