Which species acts as the oxidizing agent in the following reaction: $2,\text{Al(s)}+3,{\text{Cl}}_2\text{(g)}\to 2,{\text{AlCl}}_3\text{(s)}$?

Step-by-step solution

1. Determine oxidation states of Al and Cl in reactants and products.
2. Al changes from 0 to +3, so it is oxidised.
3. Cl changes from 0 to -1, so it is reduced.
4. The species that is reduced (gains electrons) is the oxidising agent. Hence Cl2(g).

Concept tested: Oxidising agent identification

Published 13 October 2026 · How this solution was prepared and checked