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Mention the reactions occurring at (i) anode (ii) cathode, during working of a mercury cell. Why does the voltage of a mercury cell remain constant during operation ? |
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Answer» Solution :The cell reaction are as follows: `{:("ANODE", Zn(HG) + 2OH^(-) to ZnO(s) + H_(2)O(l) + 2e^(-)),("Cathode", HgO(s) + H_(2)O(l) + 2e^(-) to Hg(l) + 2OH^(-)),("Net reaction", Zn(Hg) + HgO(s) to ZnO(s) +Hg(l)):}` Voltage of the mercury cell REMAINS CONSTANT because ions are not involved in the net reaction. |
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