1.

What is a primary cell? Write cell reaction of dry cell during its discharging.

Answer»

Primary cell: The cell in which reaction occurs only once to give energy and hence cannot be reversed and recharged.
Cell reaction during discharging.
Anode: Zn(s) → Zn2+ + 2e
Cathode: (MnO2 + NH+4 + e → MnO (OH) + NH3) × 2
Overall reaction
Zn(s) + 2 MnO2 + 2 NH+4 → Zn2+ + 2MnO(OH) + 2NH3.



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