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COMEDK2022ChemistryChemical Bonding and Molecular Structure

Increasing order of bond order of oxygen and its ions is

Options

  1. AO ₂ < O ₂⁺ < O ₂²⁻ < O ₂⁻
  2. BO ₂⁻ < O ₂²⁻ < O ₂⁺ < O ₂
  3. CO ₂⁺ < O ₂ < O ₂⁻ < O ₂²⁻
  4. DO ₂²⁻ < O ₂⁻ < O ₂ < O ₂⁺

Correct answer

D. O ₂²⁻ < O ₂⁻ < O ₂ < O ₂⁺

Step-by-step solution

Bond order = 1 2 ( bonding - antibonding electrons ) O₂ (16 e ^- ): B.O. = 1 2 (10-6) = 2.0 O₂^+ (15 e ^- ): one e ^- removed from antibonding ^* B.O. = 1 2 (10-5) = 2.5 O₂^- (17 e ^- ): one e ^- added to antibonding ^* B.O. = 1 2 (10-7) = 1.5 O₂²⁻ (18 e ^- ): two e ^- added to antibonding ^* B.O. = 1 2 (10-8) = 1.0 Increasing order: O₂²⁻(1.0) Correct option: (4)

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