Phosphorus can be stored in

$Sn$ is dissolved in excess of $NaOH$ solution,the compound obtained is

Nitric oxide $(NO)$ is prepared by the action of dilute $HNO_3$ on which of the following metals?

White phosphorus reacts with thionyl chloride to form $PCl_3$ along with $A$ and $B$. $A$ and $B$ respectively are

Consider the following statements:-
$I. \, PCl_3$ hydrolyses in the presence of moisture giving fumes of $HCl$.
$II. \, PCl_5$ exists as $[PCl_4]^+[PCl_6]^-$ in the solid state.
$III. \, $All the five bonds in the $PCl_5$ molecule are equivalent.
Choose the correct statements.

Which of the nitrogen oxides is obtained when ammonium nitrate is heated?