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Describe Mercury cell....

Describe Mercury cell.

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Mercury cell is a primary cell. Suitable for low current devices.
Anode. Zinc-Mercury amalgam
Cathode - Paste of HgO and Carbon
Electrolyte: Paste of KOH and ZnO.
Cell reactions.
`{:(,"Anode",Zn(Hg) 2OH^(-) to ZnO(s)+H_(2)O+2e^(-)),(,"Cathode",HgO+H_(2)O+2e^(-)to Hg(l)+2OH^(-)):}`
Overl all reaction: `Zn(Hg)+HgO(s) to ZnO(s)+Hg(l)`
Cell potential -1.35V
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