The nitrite ion in represented by

(I) ${\left[O-N=O\right]}^{-}$

(II) ${\left[N=O-O\right]}^{-}$

Which of the structures represents possible resonance forms of this ion?

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

Give a reason for the following:

Ionic compounds have a high melting point.

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

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

Which of the following is true?