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CBSE Class 12-science Answered

Giving Cathode and anode reaction of Nickel Cadmium cell illustrate the overall cell reaction.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
It consists of an anode made up of Cadmium and a metal grid coated with nickel oxide as Cathode. The electrolyte is Potassium Hydroxide. At anode the Cadmium metal undergoes oxidation; Cadmium loses electrons and changes to Cd2+ ions which react with Hydroxide ions from the electrolyte to give cadmium (II) Hydroxide.
anode reaction
(i) Cd(s) + 2OH-(aq) ==> Cd(OH)2(s) + 2e-
At Cathode Nickel oxide undergoes Reduction giving Nickel hydroxide.
cathode reaction
(ii) NiO2(s) + 2e-  + 2H2O ==> Ni(OH)2(s) + 2OH-(aq)
overall cell reaction

(iii) Cd(s) + NiO2(s) + 2H2O ==> Cd(OH)2(s) + Ni(OH)2(s)

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