Which of the following is the wrong statement?

Let's evaluate each statement:${\text{O}}_3$ has a bent shape due to the presence of a lone pair on the central oxygen. (Correct)In solid state, ozone is indeed violet-black. (Correct)Ozone is a diamagnetic gas because all its electrons are paired in its ground state MO configuration. (Correct)Electron count:$\text{ONCl}$: $8(\text{O})+7(\text{N})+17(\text{Cl})=32$ electrons.${\text{ONO}}^{-}$: $8(\text{O})\times 2+7(\text{N})+1(\text{charge})=16+7+1=24$ electrons.They are not isoelectronic. (Correct)Note: The question paper source indicates all statements are correct, making this a bonus question in the original exam.