$(a)$ Number of electrons in$\begin{array}{l}\mathrm{ONCl}=3.2 \mathrm{e}^{-} \\\mathrm{ONO}^{-}=24 \mathrm{e}^{-}\end{array}$
Thus, $\ce{ONCl}$ and $\ce{ONO}-$ are not isoelectronic.
$(b)\ \mathrm{O}_{3}$ has bent shape structure. Central atom $O$ is $s p^{2}$ hybridised with $1$ lone pair of electrons.
$(c)$ Ozone is violet$-$black in solid state.
$(d)\ O_{3}$ has no unpaired electrons, thus it is diamagnetic.
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