Question

Which of the following pairs of ions is isoelectronic and isostructural?

• A. $Cl{O}_3^{-},N{O}_3^{-}$
• B. $Cl{O}_3^{-},C{O}_3^{2-}$
• C. $S{O}_3^{2-},N{O}_3^{-}$
• D. $Cl{O}_3^{-},S{O}_3^{2-}$

Answer 1

The correct option is D $Cl{O}_3^{-},S{O}_3^{2-}$

Isostructural chemical compounds have similar chemical structures.

Isoelectronic terms refer to two atom, ions or molecules that have the same number of electrons.
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Number of electron:
$C{O}_3^{2-}=6+24+2=32S{O}_3^{2-}=16+24+2=42Cl{O}_3^{-}=17+24+1=42N{O}_3^{-}=7+24+1=32$
Carbonate and nitrate ions are isoelectronic with 32 electrons and isostructural of trigonal planar.


Also, $Cl{O}_3^{-}$ and $S{O}_3^{2-}$ are isoelectronic and pyramidal in shape.

Thus, option (d) is the correct answer.