Which of the following oxides is amphoteric?

The oxide that is amphoteric is AI₂O₃, also known as aluminum oxide. An amphoteric oxide is one that can react with both acids and bases to form a salt and water. In other words, it can act as both an acid and a base. When aluminum oxide reacts with an acid, it behaves as a base and undergoes a neutralization reaction, such as: AI₂O₃ + 6HCl → 2AlCl₃ + 3H₂O On the other hand, when aluminum oxide reacts with a base, it behaves as an acid and undergoes an acid-base reaction, such as: AI₂O₃ + 2NaOH + 3H₂O → 2NaAl(OH)₄ The other oxides listed do not exhibit amphoteric behavior. Sodium oxide (Na₂O), calcium oxide (CaO), and copper oxide (CuO) are basic oxides and will react with acids but not bases. Iron oxide (Fe₂O₃) is a basic oxide, but it is not soluble in water and therefore does not react with acids or bases.