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Chemistry Question on Molecular Orbital Theory

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

A

SO32−,NO3−{ SO_3^{2-} , NO^-_3 }

B

ClO3−,SO32−{ ClO_3^- , SO_3^{2-} }

C

CO32−,SO32−{CO_3^{2-} , SO_3^{2-} }

D

ClO3−,CO32−{ ClO^-_3 , CO_3^{2-}}

Answer

ClO3−,SO32−{ ClO_3^- , SO_3^{2-} }

Explanation

Solution

Number of electrons
CO32−=6+2+24=32{ CO^{2-}_3 = 6 + 2 + 24 = 32}
SO32−=16+2+24=42{SO^{2-}_3 = 16 + 2 + 24 = 42}
CIO3−=17+24+1=42{CIO^{-}_3 = 17 + 24 + 1 = 42}
CO32−=6+24+2=32{CO^{2-}_3 = 6 + 24 + 2 = 32}
NO32−=7+2+24=33{NO^{2-}_3 = 7 + 2 + 24 = 33 }
Hence, CIO3−{CIO^{-}_3} and SO32−{SO^{2-}_3} are isoelectronic and are pyramidal in shape.