Dry cell electrolyte — UPSC Prelims PYQ 2009 (Ammonium & Zinc chloride)
In a dry cell (battery), which of the following are used as electrolytes?
- Ammonium chloride and Zinc chloride
- Sodium chloride and Calcium chloride
- Magnesium chloride and Zinc chloride
- Ammonium chloride and Calcium chloride
Explanation
Option (a) is correct
- A dry cell (Leclanché cell) uses a paste-like electrolyte, not a liquid. The electrolyte consists mainly of ammonium chloride (NH₄Cl) paste. Zinc chloride (ZnCl₂) is also added to improve the cell’s performance and reduce polarisation. Other salts like sodium chloride, calcium chloride, or magnesium chloride are not used as electrolytes in dry cells.
Answer: (a): Ammonium chloride and Zinc chloride
