The element which catches fire in air at $30^o\,C$ and is stored under water is

In which of the following compounds does hydrolysis take place through $S_N^1$ and $S_N^2$ mechanisms respectively?

Select the correct diagram related to the chemical reactions of nitric oxide $(NO)$.

What is the lowest oxidation state possessed by phosphorus in its oxyacids?

$A$ tetra-atomic molecule $(A)$ on reaction with excess oxygen produces substance $(B)$. $(B)$ is a dehydrating agent. The substances $(A)$ and $(B)$ respectively will be:

At high temperatures,nitrogen directly combines with