Question
Which of the following are isoelectronic and isostructural?
$$NO_3^ - ,CO_3^{2 - },ClO_3^ - ,S{O_3}$$
A.
$$NO_3^ - ,CO_3^{2 - }$$
B.
$$S{O_3},NO_3^ - $$
C.
$$ClO_3^ - ,CO_3^{2 - }$$
D.
$$CO_3^{2 - },S{O_3}$$
Answer :
$$NO_3^ - ,CO_3^{2 - }$$
Solution :
NOTE : Isoelectronic species have same number of electrons and isostructural species have same type of hybridisation at central atom.
$$NO_3^ - ;$$ No. of $${e^ - } = 7 + 8 \times 3 + 1 = 32,$$ hybridisation of $$N$$ in $$NO_3^ - $$ is $$s{p^3}$$
$$CO_3^{2 - };$$ No. of $${e^ - } = 6 + 8 \times 3 + 2 = 32,$$ hybridisation of $$C$$ in $$CO_3^{2 - }$$ is $$s{p^3}$$
$$ClO_3^ - ;$$ No. of $${e^ - } = 17 + 8 \times 3 + 1 = 42,$$ hybridisation of $$Cl$$ in $$ClO_3^ - $$ is $$s{p^3}$$
$$S{O_3};$$ No. of $${e^ - } = 16 + 8 \times 3 = 40,$$ hybridisation of $$S$$ in $$S{O_3}$$ is $$s{p^2}$$
$$\therefore NO_3^ - $$ and $$CO_3^{2 - }$$ are isostructural and isoelectronic.