Question

Certain cells are given below.

1. Classify them into primary, secondary and fuel cells. (Mercury cell, Nickel-Cadmium cell, Lead storage battery, H_2-  O₂ cell, Dry cell)

2. Represent the cell in which the overall reaction is,

Cd + 2Ag⁺ → Cd²⁺ + 2Ag

Answer 1

1. Primary cells : Mercury cell, Dry cell Secondary cells: Nickel-Cadmium cell, Lead storage battery.

Fuel cell : H₂ – O₂ cell

2. Cd → Cd²⁺ + 2e^- (Oxidation half cell)

2Ag⁺ + 2e^- → 2Ag (Reduction half cell)

Therefore the cell is represented as Cd | Cd²⁺|| Ag⁺| Ag.