Which blue liquid is obtained on reacting equimolar amounts of two gases at $-30\,^oC$?

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

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

Discuss the variations in atomic and ionic radii of elements,the trends in ionisation enthalpies and electronegativity of group-$15$ elements.

The number$(s)$ of $-OH$ group$(s)$ present in $H_3PO_3$ and $H_3PO_4$ is/are

With reference to protonic acids,which of the following statements is correct?