Aluminium is described as an amphoteric metal because its oxide
Areacts with both acids and basesCORRECT
Bis insoluble in water
Creacts only with strong acids
Dforms a protective layer on the metal surface
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Amphoteric oxides are those that can react with both acids and bases. Aluminium oxide (Al₂O₃) reacts with acids to form aluminium salts and with bases (such as NaOH) to form aluminates. This dual behaviour is the defining characteristic of amphoteric substances.
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