Write the name of the cell which is generally used in hearing aids. Write the reactions taking place at the anode and cathode of this cell.
A mercury battery, used for hearing aids and electric watches, delivers a constant voltage of 1.35 V for long periods.
The half-reactions are
Anode:
Zn (Hg) + 2 OH ̶ → ZnO (*) + H2O + 2e ̶
Cathode:
HgO + H2O + 2e ̶ → Hg (l) + 2 OH ̶
