Find the element, which displays greater ability to form $p \pi-p \pi$ multiple bonds to itself and to other elements in the same block.

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:

In the Birkeland-Eyde process,the raw material used is:

Nitrous oxide $(N_2O)$ is........

Which of the following elements does not exhibit the inert pair effect?

Which one of the following is used to remove moisture from ammonia gas?