Question

4. Rusting of iron is _______ change.

Answer 1

• A chemical change occurs when there is a change in the chemical properties of the substance and a new substance is formed.
• Iron $\left(\mathrm{Fe}\right)$ reacts with oxygen $\left({\mathrm{O}}_2\right)$ and moisture present in the air and hydrated Iron oxide $({\mathrm{Fe}}_2{\mathrm{O}}_3,{\mathrm{xH}}_2\mathrm{O})$ is formed. This process is called rusting of iron.
• As a new substance, hydrated Iron oxide is formed, so it is a chemical change.

Hence, rusting of iron is a chemical change.