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Question:

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

SO2⁻,NO⁻

ClO⁻,SO2⁻

CO2⁻,SO2⁻

ClO⁻,CO2⁻

Solution:

ClO⁻,SO2⁻ are isoelectronic and isostructural. Total number of electrons present in ClO⁻=17+8(3)+1=42
Total number of electrons present in SO2⁻=16+8(3)+2=42
Both contains one lone pair of electrons and three bonding domains. Hence, the central atom in these undergoes sp3 hybridization which results in pyramidal geometry.