The correct order of increasing $C - O$ bond length of $CO, CO_3^{2-}, CO_2$ is

The $C-O$ bond length in $CO$,$CO_2$ and $CO_3^{2-}$ follows the order.

Which of the following orders of resonance energy is correct?

Which one of the following is not a resonance structure of $CO_2$?

$H_3PO_3$ can be represented by structures $(1)$ and $(2)$ shown below. Can these two structures be taken as the canonical forms of the resonance hybrid representing $H_3PO_3$? If not,give reasons for the same.

Which is the most important contributing resonating structure of $[CH_2=N(=O)=O]^-$?