Which of the following is a non-combustible hydride?

On reaction with $Cl_2$,phosphorus forms two types of halides $A$ and $B$. Halide $A$ is a yellowish-white powder,while halide $B$ is a colourless oily liquid. Identify $A$ and $B$ and write the formulas of their hydrolysis products.

Which of the following processes does not produce ammonia gas?

In some of the reactions,thallium resembles aluminium,whereas in others,it resembles group-$I$ metals. Support this statement by giving some evidence.

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

$A$ colourless,neutral,paramagnetic oxide of nitrogen '$P$' on oxidation gives reddish brown gas $Q$. $Q$ on cooling gives colourless gas $R$. $R$ on reaction with $P$ gives blue solid $S$. Identify $P, Q, R, S$ respectively.