Back to Directory
NEET CHEMISTRYMedium

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

A

CO₃²⁻, SO₃²⁻

B

ClO₃⁻, CO₃²⁻

C

SO₃²⁻, NO₃⁻

D

ClO₃⁻, SO₃²⁻

Step-by-Step Solution

  1. Define Isoelectronic: Isoelectronic species have the same number of valence electrons (or total electrons).
  2. Define Isostructural: Isostructural species have the same hybridization and shape (arrangement of atoms).
  3. Analyze Option D (ClO3−ClO_3^- and SO32−SO_3^{2-}):
  • ClO3−ClO_3^-: Valence electrons = 7(Cl)+3×6(O)+1(charge)=267 (Cl) + 3 \times 6 (O) + 1 (charge) = 26. Structure: Cl has 7 valence electrons. 3 form bonds with O, 1 remains as a lone pair. Hybridization is sp3sp^3 (3 bond pairs + 1 lone pair). Shape is Trigonal Pyramidal.
  • SO32−SO_3^{2-}: Valence electrons = 6(S)+3×6(O)+2(charge)=266 (S) + 3 \times 6 (O) + 2 (charge) = 26. Structure: S has 6 valence electrons. 3 form bonds with O, 1 remains as a lone pair. Hybridization is sp3sp^3. Shape is Trigonal Pyramidal.
  • Conclusion: Both have 26 valence electrons and Trigonal Pyramidal shape.
  1. Check other options:
  • CO32−CO_3^{2-} (24e−24 e^-, Trigonal Planar) vs SO32−SO_3^{2-} (26e−26 e^-, Pyramidal).
  • NO3−NO_3^- (24e−24 e^-, Trigonal Planar).
Practice Mode Available

Master this Topic on Sushrut

Join thousands of students and practice with AI-generated mock tests.

Get Started