The pair that contains two $P-H$ bonds in each of the oxoacids is

$A + H_2O \to B + HCl$
$B + H_2O \to C + HCl$
Compound $(A), (B)$ and $(C)$ will be respectively

Match List $I$ with List $II$:

List $I$ Oxide	List $II$ Type of Bond
$A. N_2O_4$	$I. 1 N-O$ bond
$B. NO_2$	$II. 1 N-O-N$ bond
$C. N_2O_5$	$III. 1 N-N$ bond
$D. N_2O$	$IV. 1 N=N / N\equiv N$ bond

Choose the correct answer from the options given below:

Which of the following is the least basic?

The most stable hydride is

Draw the structures of the following oxoacids of phosphorus:
$(i)$ Orthophosphoric acid $(H_{3}PO_{4})$
$(ii)$ Pyrophosphoric acid $(H_{4}P_{2}O_{7})$
$(iii)$ Orthophosphorus acid $(H_{3}PO_{3})$
$(iv)$ Hypophosphorus acid $(H_{3}PO_{2})$
$(v)$ Cyclotrimetaphosphoric acid $((HPO_{3})_{3})$
$(vi)$ Polymetaphosphoric acid $((HPO_{3})_{n})$