Chemistry - Electrochemistry Question with Solution | TestHub

A) Leclanché cell → s

In a Leclanché (dry) cell, zinc acts as the anode.

The anode reaction is: Zn → Zn²⁺ + 2e⁻

B) Nickel-Cadmium cell → r

Ni–Cd cell is a secondary cell, meaning it can be recharged.

C) Fuel cell → p, t

Fuel cell (H₂–O₂ cell) has the overall reaction:

2H₂ + O₂ → 2H₂O (p)

It also converts chemical (combustion) energy into electrical energy (t).

D) Mercury cell → q

Mercury cell does not involve free ions in solution and is used in hearing aids.