Question

Metal A burns in air, on heating, to form an oxide A₂O₃ whereas another metal B burns in air only on strong heating to form an oxide BO. The two oxides A₂O₃ and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.

1. What is the nature of oxide A₂O₃?
2. What is the nature of oxide BO?
3. Name one metal like A.
4. Name one metal like B.

Answer 1

1. The oxide A₂O₃ is amphoteric, which can react with both acids and bases to form a salt and water.
2. The oxide BO is amphoteric, which can react with both acids and bases to form a salt and water.
3. Aluminium is a metal like A, which forms Al₂O₃ on reacting with oxygen.
4. Zinc is a metal like B that forms ZnO upon strong heating in air (oxygen).