Aluminium oxide is an amphoteric oxide.

1. Metal oxides that show both acidic as well as basic properties are known as amphoteric oxides.
2. They react with acid as well as base to form salt and water.
3. Aluminium oxide behaves as an acid while reacting with a base and behaves as a base while reacting with an acid to form salt and water.
Hence, aluminium oxide is an amphoteric oxide.

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