Question

The metallic oxide, which when reacted with HCl, forms salts and water.

Options

• Carbon monoxide

• Nitrous oxide

• Ammonium hydroxide

• Sodium oxide

Answer 1

Sodium oxide

Explanation:

Sodium oxide (Na₂O) is a basic metallic oxide that undergoes a neutralisation reaction with hydrochloric acid (HCl) to form sodium chloride salt and water. Carbon monoxide and nitrous oxide are non-metallic neutral oxides, while ammonium hydroxide is a soluble base but not an oxide.