Answer :

The following diagram represents a mercury cell.

The reactions take place inside a mercury cell are as follows:

Anode: Zn(Hg) + 2OH ZnO(s) + H2O + 2e

Cathode: HgO + H2O + 2e Hg(l) + 2OH

Galvanic cell equation: Zn(Hg) + HgO(s) ZnO(s) + Hg(l)

The above overall reaction contains no ions whose concentration can change over time. So, the cell potential remains constant throughout the mercury cell life.

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