$NH_3$ reacts with bleaching powder to give:

What may be expected to happen when phosphine gas is mixed with chlorine gas?

Zinc on reaction with concentrated nitric acid gives an oxide of nitrogen $(A)$. Zinc with dilute nitric acid gives another oxide of nitrogen $(B)$. Oxidation numbers of nitrogen in $(A)$ and $(B)$ are respectively:

The reaction of aqueous $NaOH$ with white $P_4$ is given by: $P_4 + NaOH (aq) \rightarrow PH_3 + X$. The compound $X$ is:

$NO_2$ is a mixed oxide. This is proved by the fact that it reacts with $H_2O$ and then with $NaOH$ to form:

The oxides of nitrogen obtained by the reaction of nitric acid with $(i)$ $P_4O_{10}$ and $(ii)$ $P_4$ respectively are: