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Types of Redox Reactions

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Question

write the reaction ocuring at cathode and anode in nickel cadmium battery.

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Solution

at anode (oxidation):
Cd + 2OH- = Cd(OH)2 + 2e-

at cathode (reduction):
NiO2+ 2H2O + 2e- = Ni(OH)2 + 2 OH-

Nickel-cadmium cell :
Discharging reaction - Cd(s) + 2Ni(OH)₃ (s)→ CdO(s) + 2Ni(OH)₂ (s) + H₂O (l)
charging reaction - CdO(s) + 2Ni(OH)₂ (s) + H₂O (l) → Cd(s) + 2Ni(OH)₃ (s)

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E^{o}

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