Which of the following mixtures of two gases in equimolar amounts gives a blue liquid at $-30\,^oC$?

Hydrolysis of phosphorus trichloride in water gives:

Phosphorus has three allotropic forms:
$(i)$ white phosphorus
$(ii)$ red phosphorus and
$(iii)$ black phosphorus.
Write the difference between white and red phosphorus on the basis of their structure and reactivity.

The oxide of nitrogen formed by thermal decomposition of $NH_4NO_3$ is

Strong reducing behaviour of $H_3PO_2$ is due to

Which of the following represents the correct order of the inert pair effect?