Correct Answer: Option C

Explanation

C. Ammonium chloride.

It is the electrolyte in the wet Leclanché cell (aqueous solution).Others:

Nickel hydroxide: In Ni-Cd/Ni-MH batteries.

Lead dioxide: Cathode in lead-acid batteries.

Carbon: Conductivity enhancer, not electrolyte.

There is an explanation video available below.

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