Question

Which is(are) true about $N_2{O}_5$?

• A. It is an anhydride of nitric acid.
• B. In solid state, it exists as $N{O}_2^{+}N{O}_3^{-}$
• C. It is structurally similar to $P_2{O}_5$
• D. It can be prepared by heating $HN{O}_3$ over $P_2{O}_5$

Answer 1

Answer: (A), (B), (D)

It can be prepared by heating $HN{O}_3$ over $P_2{O}_5$

$N_2{O}_5$ - Nitrogen (V) oxide can be prepared by heating $HN{O}_3$ over the dimer of $P_2{O}_5$:

$4HN{O}_3+P_4{O}_{10}⟶2N_2{O}_5+4HP{O}_3$

$N_2{O}_5+2H_{2}O⟶2HN{O}_3$

In the solid state, $N_2{O}_5$ exists as nitronium nitrate - $N{O}_2^{+}N{O}_3^{-}$

The structure of nitrogen pentoxide is very different from phosphorus pentoxide: