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.

Answer 1

The answer you're looking for is:

The cathode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.

Step-by-step explanation:

I just took the test, so this is correct.

Answer 2

I think you forgot to put the chosen and the correct answer along with your question. The statement "The anode reaction is Cd + 2OH- (arrow) Cd(OH)2 + 2e-" is the correct statement. This statement is valid and correct because Cadmium gets oxidized and releases two electrons. These electrons helps in the formation of Cd(OH)2. I hope the explanation has helped you.