Question

Can someone please tell me why this answer is correct?


In a nickel-cadmium dry cell, which of the following statements is true?

The cathode reaction is Cd + 2OH- (arrow) Cd(OH)2 + 2e-

The anode reaction is NiO2 + H2O + 2e- (arrow) Ni(OH)2 + 2OH-

The cathode reaction is Cd + NiO2 + 2H2O (arrow) Cd(OH)2 + Ni(OH)2.

CORRECT The anode reaction is Cd + 2OH- (arrow) Cd(OH)2 + 2e-

Answer 1

In anode, Cd is oxidized and it gives two electrons.
Because it is Cd2+ ion it forms Cd(OH)2