The nitrogen-containing compound produced in the reaction of HNO3 with P4O10 is: It can also be prepared by reaction of P4 and HNO3; is diamagnetic; contains one N−N bond; reacts with Na metal producing a brown gas.

4HNO3 + P4O10 → 2N2O5 + 4HPO3
So, the nitrogen-containing compound is N2O5 (A)
P4 + 20HNO3 → 4H3PO4 + 20NO2 + 4H2O
N2O5 can't be prepared by the reaction of P4 and HNO3 (B)
N2O5 is diamagnetic (C)
Structure of N2O5 is: (image)
(D) N2O5 + Na → NaNO3 + NO2↑
Nitrogen dioxide (NO2) appears as a reddish-brown gas.
Options B and D are correct.