Which gas is used in the manufacturing of nitrogenous fertilizers?

Which halide of nitrogen is least basic?

Which is the strongest Lewis base among the following?

Two oxides of nitrogen, $NO$ and $NO_2$, react together at $253 \ K$ to form a compound of nitrogen $X$. $X$ reacts with water to yield another compound of nitrogen $Y$. The shape of the anion of $Y$ is:

The bond energies (in $kJ \ mol^{-1}$) of $N-H$,$P-H$,and $As-H$ are respectively:

Pure $N_2$ is not produced when