Which of the following oxides of nitrogen is a mixed anhydride of two acids?

Which of the following substances releases nitrogen gas upon thermal decomposition?

Why is nitrogen chemically inert?

Which element from group $15$ ($V$ group) forms the most basic compound with hydrogen?

Which of the following compounds does not give an oxyacid of the central atom on hydrolysis?

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.