CBSE Class 12-science Answered
Name the cell commonly used in watches and video cameras. Also write the chemical reaction involved in it?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
Mercury cells are used in watches and video cameras. The chemical reactions involved in it are as follows:
AT ANODE: Zn + 2OH- 
ZnO(s) + H2O (l) + 2e-
ZnO(s) + H2O (l) + 2e-AT CATHODE: HgO (s) + H2O (l) + 2e- Hg (l) + 2OH-
Hg (l) + 2OH-NET REACTION: Zn (Hg) + HgO(s) ZnO(s) + Hg (l)
ZnO(s) + Hg (l)
Answered by | 04 Jun, 2014, 03:23: PM
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