Which of the following pairs of iron are isoelectronic and isostructural?

1. ${\mathrm{C}\mathrm{O}}_3^{2-},\mathrm{ }{\mathrm{S}\mathrm{O}}_3^{2-}$
2. ${\mathrm{C}\mathrm{l}\mathrm{O}}_3^{-},\mathrm{ }{\mathrm{C}\mathrm{O}}_3^{2-}$
3. ${\mathrm{S}\mathrm{O}}_3^{2-},\mathrm{ }{\mathrm{N}\mathrm{O}}_3^{-}$
4. ${\mathrm{C}\mathrm{l}\mathrm{O}}_3^{-},\mathrm{ }{\mathrm{S}\mathrm{O}}_3^{2-}$

Solution

Isoelectronic (same no of electrons)
${\mathrm{C}\mathrm{l}\mathrm{O}}_3^{-}\mathrm{ }\&\mathrm{ }{\mathrm{S}\mathrm{O}}_3^{2-}\Rightarrow 17+24+1=42$
and $16+24+2=42$
Isostructural (same type of hybridization)
${\mathrm{C}\mathrm{l}\mathrm{O}}_3^{-}\Rightarrow \mathrm{H}=\frac{1}{2}\left(7+1\right)=4\mathrm{ }\left(\mathrm{s}{\mathrm{p}}^3\right)$
${\mathrm{S}\mathrm{O}}_3^{2-}\Rightarrow \mathrm{H}=\frac{1}{2}\left(6+2\right)=4\mathrm{ }\left(\mathrm{s}{\mathrm{p}}^3\right)$

Asked in: NEET 2015 (Phase 1)

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