Give reason:
Aluminium is a highly reactive metal, yet it is used to make utensils for cooking

Explanation

**Step-by-Step Solution:**

1. **Understanding Reactivity of Aluminium**: Aluminium is known to be a highly reactive metal. This means that it can easily react with other substances, including oxygen, moisture, and acids.

2. **Formation of Aluminium Oxide**: When aluminium is exposed to air, it reacts with oxygen to form a thin layer of aluminium oxide (Al₂O₃) on its surface. This layer is very thin but is highly protective.

3. **Corrosion Resistance**: The aluminium oxide layer acts as a barrier that prevents further oxidation of the underlying aluminium. This means that even though aluminium is reactive, the presence of this protective layer stops it from reacting with moisture and other substances in the environment, thus preventing corrosion.

...