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NEET CHEMISTRYChemical Bonding and Molecular StructureMedium

Question

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).

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Chemical Bonding and Molecular Structure. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYChemical Bonding and Molecular Structurefollowingisoelectronicisostructural

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