Question

Nickel and cadmium are used in combination.

• A. As a catalyst
• B. In alloys that can resist high pressure
• C. In electric batteries having a very long life
• D. In cooking utensils

Answer 1

Answer: (C)

In electric batteries having a very long life

Nickel and cadmium combination are used in electric batteries having a very long life.

The half cell reaction taking place,

$Cd(OH{)}_2+2e^{-}⟶Cd(s)+2O{H}^{⊝}{E}^o=-0.403$ $V$

$2NiO\left(OH\right)+2H_{2}O+2e⟶2Ni(OH{)}_2+2O{H}^{⊝}{E}^o=1.32$ $V$

$E_{cell}=1.72$

Hence, used in electric batteries.