According to MO theory which of the lists ranks the nitrogen species in terms of increasing bond order?

Decreasing order of stability of ${\mathrm{O}}_2,\mathrm{ }{\mathrm{O}}_2^{-},\mathrm{ }{\mathrm{O}}_2^{+}$ and ${\mathrm{O}}_2^{2-}$ is:

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

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

Which of the following is true?