Which of the following,when subjected to thermal decomposition,will liberate dinitrogen?
$(i)$ Sodium nitrate
$(ii)$ Ammonium dichromate
$(iii)$ Barium azide

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.

Phosphorus forms a number of oxoacids. Out of these oxoacids,phosphinic acid $(H_3PO_2)$ has strong reducing properties. Write its structure and also write a reaction showing its reducing behavior.

The pair in which phosphorus atoms have a formal oxidation state of $+3$ is:

Of the following hydrides,which has the lowest boiling point?

Which of the nitrogen oxides is obtained when ammonium nitrate is heated?