1.

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.

Answer»

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 (s) + H2O + 2e ̶

Cathode:

HgO + H2O + 2e ̶ → Hg (l) + 2 OH ̶



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