State the reason for the following :
Aluminium oxide is called an amphoteric oxide.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Amphoteric Oxide**: An amphoteric oxide is defined as an oxide that can react with both acids and bases to form salts and water.

2. **Chemical Formula of Aluminium Oxide**: The chemical formula for aluminium oxide is Al₂O₃.

3. **Reaction with Acids**: When aluminium oxide reacts with an acid, it exhibits basic properties. For example, when it reacts with hydrochloric acid (HCl), it forms aluminium chloride (AlCl₃) and water (H₂O):
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