Sodium hydroxide solution reacts with phosphorus to give phosphine. To bring about this reaction,we need

Consider the reaction:
$P_4 + 3 NaOH + 3 H_2 O \rightarrow Q + 3 NaH_2 PO_2$
Identify the reaction in which $Q$ is not the product. (Equations are not balanced)

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

Phosphine may be produced by adding water to

Which of the following elements forms oxides in all oxidation states from $+I$ to $+V$?

The nature of the two oxides of nitrogen,$X$ and $Y$,formed in the reaction of sodium nitrite $(NaNO_2)$ with hydrochloric acid $(HCl)$ is: