The molecular formula for phosgene and tear gas are ______ and ______ respectively.

Which is TRUE with regard to the properties of ${\mathrm{PH}}_{\mathrm{3}}$?

Which element of the nitrogen family produces maximum number of oxo$-$acids?

What is the basicity of orthophosphorus acid?

${\mathrm{P}}_{\mathrm{4}}{\mathrm{O}}_{\mathrm{10}}$ is the anhydride of ______.

Which among the following group $16$ elements, exists in more number of  allotropic states?

Which is the most stable allotrope of sulphur?

Amongst ${\mathrm{H}}_{\mathrm{2}}\mathrm{O}, {\mathrm{H}}_{\mathrm{2}}\mathrm{S}, {\mathrm{H}}_{\mathrm{2}}\mathrm{Se} \text{and} {\mathrm{H}}_{\mathrm{2}}\mathrm{Te}\text{,}$ the one with the highest boiling point is ______.

Which among the following compounds act as a reducing agent?