The nitrite ion, ${\text{NO}}_2^{-}$ may be represented by two major resonance forms, the lengths of the N-O bonds in this ion are expected to be

The above compound represents hydrogen azide, the bond orders of bonds $\left(\mathrm{I}\right)$ and $\left(\mathrm{II}\right)$ are:

The molecule/molecules that has/have delocalised lone pair(s) of electrons is/are

Give a reason for the following:

Ionic compounds have a high melting point.

Resonance in carbonate ion $\left({\mathrm{CO}}_3^{2-}\right)$ is

Which of the following is true?