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Write the name of the cell used in heari...

Write the name of the cell used in hearing aids. Write the reactions takes place at the anode and the cathode of this cell.

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Mercury cell
`{:("At anode : "Zn(s)+2OH^(-)rarrZnO(s)+H_(2)O+2e),("At cathode : "HgO(s)+H_(2)O+2erarrHg(l)+2OH^(-)),(bar(" "Zn(s)+HgO(s)rarrZnO(s)+Hg(l)" ")):}`
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