1(vii)
The metallic oxide which when reacts with HCl forms salt and water:
- (a)Carbon monoxide
- (b)Nitrous oxide
- (c)Ammonium hydroxide
- (d)Sodium oxide
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Sodium oxide
Reason — Sodium oxide reacts with HCl and forms the salt sodium chloride and water
2HCl + Na2O ⟶ 2NaCl + H2O