How can you synthesise nitric oxide in the laboratory?

The number of $P-O-P$ bonds in cyclic metaphosphoric acid is ....

Which of the following reactions gives nitrogen $(II)$ oxide $(NO)$ as one of the products?

The elements $N$,$P$,$As$,$Sb$,and $Bi$ belong to which group?

$N_2$ forms $NCl_3$,whereas $P$ can form both $PCl_3$ and $PCl_5$. Why?

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{P}Cl_5 + H_2O \longrightarrow H_3PO_4 + HCl$