Question

Which of the following oxides of nitrogen is the an hydride of nitrous acid?

• A. $NO$
• B. $N_2{O}_3$
• C. $N_2{O}_4$
• D. $N_2{O}_5$

Answer 1

Answer: (B)

$N_2{O}_3$

1. Two oxides of nitrogen are acid anhydrides; that is, they react with water to form nitrogen-containing oxyacids. Dinitrogen trioxide($N_2{O}_3$) is the anhydride of nitrous acid, HNO2, and dinitrogen pentoxide($N_2{O}_5$) is the anhydride of nitric acid, HNO3.
2. Hence option B is correct.