Which of the following oxides is amphoteric in nature ?
Al2O3
An amphoteric oxide is one that reacts with both acids and bases to form salt and water.
Aluminium oxide shows this behaviour: with hydrochloric acid it forms aluminium chloride and water, and with sodium hydroxide it forms sodium aluminate and water.
Calcium oxide, sodium oxide and magnesium oxide are oxides of strongly metallic elements and are basic oxides; they react only with acids.
Hence, Al2O3.
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