Give reason for the following: Aluminium is a reactive metal but does not corrode easily.

Explanation

**Step-by-Step Solution:**

1. **Understanding Reactivity of Aluminium:**
- Aluminium is classified as a reactive metal because it readily reacts with oxygen and other elements. This reactivity is due to its tendency to lose electrons and form positive ions.

2. **Formation of Aluminium Oxide:**
- When aluminium is exposed to air, it reacts with atmospheric oxygen to form aluminium oxide (Al₂O₃). This reaction occurs quickly and forms a protective layer on the surface of the aluminium.

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