The number of hydrogen atom$(s)$ attached directly to the phosphorus atom in hypophosphorous acid $(H_3PO_2)$ is:

Which pair of oxyacids of phosphorus contains $P-H$ bonds?

Assertion : Molecular nitrogen is less reactive than molecular oxygen.
Reason : The bond length of $N_2$ is shorter than that of oxygen.

Which of the following is a non-combustible hydride?

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:

The nitrogen-containing compound produced in the reaction of $HNO_3$ with $P_4O_{10}$:
$(A)$ can also be prepared by the reaction of $P_4$ and $HNO_3$
$(B)$ is diamagnetic
$(C)$ contains one $N-N$ bond
$(D)$ reacts with $Na$ metal producing a brown gas