(a) Draw the structure of an oxide of nitrogen where the oxidation state of nitrogen is +5.
(b) With the help of a balanced chemical equation, suggest what happens when white phosphorus reacts with NaOH solution in an inert atmosphere.
(a) An oxide of nitrogen where the oxidation state of nitrogen is +5 is N2O5.

(b) Phosphine is obtained when white phosphorus reacts with NaOH solution in an inert atmosphere.
P4 + 3NaOH +3H2O → PH3 + 3NaH2PO2
(Phosphine)