COMEDK2021ChemistryChemical Bonding and Molecular Structure
Which of the following pairs of ions in iso-electronic and iso-structural?
Options
- ACO ₃²⁻, NO ₃⁻
- BSO ₃²⁻, NO ₃⁻
- CClO ₃⁻, CO ₃²⁻
- DSO ₃²⁻, CO ₃²⁻
Correct answer
A. CO ₃²⁻, NO ₃⁻
Step-by-step solution
Iso-electronic species have the same number of electrons, and iso-structural species have the same geometry and hybridization. For CO ₃²⁻ : Total electrons = 6 + 3 8 + 2 = 32 . Hybridization: 1 2 (4 + 0 + 2) = 3 (sp ^2 hybridization). Geometry: Trigonal planar. For NO ₃⁻ : Total electrons = 7 + 3 8 + 1 = 32 . Hybridization: 1 2 (5 + 0 + 1) = 3 (sp ^2 hybridization). Geometry: Trigonal planar. Since both CO ₃²⁻ and NO ₃⁻ have 32 electrons and sp ^2 hybridized trigonal planar structures, they are both iso-electronic