Question

Four statements about the reactions of oxides with dilute hydrochloric acid and aqueous sodium hydroxide are listed.

1. Aluminium oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide.
2. Calcium oxide reacts with dilute hydrochloric acid and aqueous sodium hydroxide.
3. Zinc oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide.
4. Sulphur dioxide does not react with either dilute hydrochloric acid or aqueous sodium hydroxide.

Which statements are correct?

Options

• I and II

• I and III

• II and IV

• III and IV

Answer 1

I and III

Explanation:

Al₂O₃ and ZnO are amphoteric oxides, so they react with both dilute HCl and aqueous NaOH.