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CBSE Class 12-science Answered

Write down the reactions taking place at the electrodes of a Mercury cell.

At Anode: The Oxidation of Zinc metal takes place and the Zinc ions react with the OH- ions from the electrolyte to form Zinc hydroxide.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
           Zn (s)  Zn2+ 2e-
       Zn2+   + 2 OH-         Zn (OH)2
At Cathode: The reduction of Mercuric Oxide to mercury metal takes place.
       HgO (s) + H2O + 2e-  Hg (l) + 2OH-
The Overall reaction is :

       Zn (s) +  HgO (s) Zn (OH)2 + Hg (l)

Answered by | 04 Jun, 2014, 03:23: PM
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