The overall reaction of a nickel-cadmium cell during discharge is Cd + 2Ni(OH)3 -> CdO + 2Ni(OH)2 + H2O. Which statement is correct?

Nickel changes its oxidation state from +3 to +2 at the cathode

Cadmium is reduced at the cathode

Nickel changes its oxidation state from +3 to +2 at the cathode

The electrolyte is dilute sulphuric acid

The cell is a primary cell and cannot be recharged

JEE Main levelSingle correct optionDifficulty 2 of 3ec155

The overall reaction of a nickel-cadmium cell during discharge is $Cd + 2 Ni (OH) X_{3} CdO + 2 Ni (OH) X_{2} + H X_{2} O$ . Which statement is correct?

Cadmium goes from

0

+ 2

(

Cd CdO

), so it is oxidised and is the anode. Nickel goes from

+ 3

Ni (OH) X_{3}

+ 2

Ni (OH) X_{2}

, a reduction, so

Ni (OH) X_{3}

is the cathode material. The electrolyte is alkaline

KOH

, and the cell is a secondary cell with long life. Only (B) is correct.