During which of the following processes is phosphine $(PH_3)$ $NOT$ obtained?

Consider the following Assertion $(A)$: Phosphorus can form both phosphorus$(III)$ and phosphorus$(V)$ chlorides,but nitrogen cannot form nitrogen$(V)$ chloride. Reason $(R)$: The electronegativity of nitrogen is more than that of phosphorus. The correct answer is

Among the oxides of nitrogen $N_2O_3$,$N_2O_4$,and $N_2O_5$,the molecule$(s)$ having nitrogen-nitrogen bond is/are

What compounds are formed when phosphine $(PH_3)$ is absorbed in a solution of mercuric chloride $(HgCl_2)$?

In the following reaction,identify the nature of the products formed by the complete hydrolysis of $\underline{P}_4O_8$ at $R.T$:
$\underline{P}_4O_8 + H_2O \longrightarrow H_3PO_3 + H_3PO_4$

The reaction of $P_4$ with $X$ leads selectively to $P_4O_6$. The $X$ is