The electrolyte used in mercury cell is
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Paste of KOH and ZnO
In the mercury cell the electrolyte is a paste of KOH and ZnO.
No ion appears in the cell reaction, so the concentration of the electrolyte does not change during use, and the cell gives a constant potential of about 1.35 V.
NCERT (2026-27 edition):
Primary Batteries – …
