Question

Which of the following oxides of nitrogen is the anhydride of nitrous acid?

Options

• NO

• N₂O₃

• N₂O₄

• N₂O₅

Answer 1

N₂O₃

Explanation:

Dinitrogen trioxide (N₂O₃) is the anhydride of nitrous acid (HNO₂). When N₂O₃ reacts with water, it forms nitrous acid. Hence, N₂O₃ is called the anhydride of nitrous acid because it produces the acid when combined with water.