The cause of resonance is....

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

Explain with a suitable example that the resonance structures of a molecule do not represent its real structure and are hypothetical.

The most unlikely representation of resonance structures of $p-$nitrophenoxide ion is

Draw the resonance structures of $N_2O_5$,state its shape,and indicate the bond angles and bond lengths.

In $O_{2}$ and $H_{2}O_{2}$, the $O-O$ bond lengths are $1.21 \mathring{A}$ and $1.48 \mathring{A}$ respectively. In ozone $(O_{3})$, the average $O-O$ bond length is