What is the nature of hydrides and oxides of Group $15$ elements?

The products of hydrolysis of isohypophosphoric acid are the same as those of which of the following compounds?

The reaction,which forms nitric oxide $(NO)$,is

An inorganic salt $(A)$ is decomposed at about $523 \ K$ to give products $(B)$ and $(C).$ Compound $(C)$ is a liquid at room temperature and is neutral to litmus paper,while oxide $(B)$ on burning with white phosphorus,gives a dehydrating agent $(D).$ Compounds $(A)$,$(B)$,$(C)$ and $(D)$ will be identified as:

What are the boiling points of nitrogen and oxygen gases?

Which statement is wrong for $NO$?