CBSE Class 12 Chemistry 2017 Outside Delhi Set 1 Solved Paper

Question : 9

Total: 26

Write the name of the cell which is generally used in hearing aids. Write the reactions taking place at the anode and the cathode of this cell.

Solution:

Mercury cell is generally used in hearing aids.
At anode: Zn(Hg)+2OH−→ZnO( s)+H2O+2e−
At cathode: HgO( s)+H2O+2e−→Hg(l)+2OH−
Overall reaction: Zn(Hg)+HgO( s)→ZnO( s)+Hg(l)

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