Question

Which of the following is known as anhydride of nitric acid ?

• A. $N_2{O}_3$
• B. $N_2{O}_4$
• C. $N_2{O}_5$
• D. $N_{2}O$

Answer 1

The correct option is C $N_2{O}_5$

The anhydride of an acid is the acidic oxide which on hydration forms the acid. Dinitrogen pentoxide is the anhydride of nitric acid. Hydration of $N_2{O}_5$ gives $HN{O}_3$.
$N_2{O}_5+H_{2}O\to 2HN{O}_3$

Hence, the correction option is (C)