White phosphorus contains

Which blue liquid is obtained on reacting equimolar amounts of two gases at $-30\,^oC$?

Due to $p\pi - p\pi$ bonding interactions, nitrogen forms $N_2$ but phosphorus forms $X$ and does not form a diatomic molecule. Identify $X$.

Rationalize the given statements and provide chemical reactions:
$1$. Lead $(II)$ chloride reacts with $Cl_2$ to give $PbCl_4$.
$2$. Lead $(IV)$ chloride is highly unstable towards heat.
$3$. Lead is known not to form an iodide,$PbI_4$.

In which of the following reactions is phosphine $(PH_3)$ $NOT$ produced?

Which of the following orders regarding the stability of phosphorus allotropes is correct?