Question

Which of the following are isoelectronic and isostructural?

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

Answer 1

The correct option is A $N{O}_3^{-}$, $C{O}_3^{2-}$

Since the number of electrons is same in $N{O}_3^{-}$ and $C{O}_3^{2-}$ i.e. 32, therefore they are isoelectronic.

For $N{O}_3^{-}$ no.of electrons = $7+(8\times 3)+1$ = 32

For $C{O}_3^{2-}$ no. of electrons = $6+(8\times 3)+2$ = 32

Also, the geometry for both $C{O}_3^{2-}$ and $N{O}_3^{-}$ is $s{p}^2$ and trigonal planar shape. Therefore, both are isostructural too.

Therefore, option A is correct.