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KCET2013ChemistryChemical Bonding and Molecular Structure

The number of anti-bonding electrons present in O ₂⁻ molecular ion is

Options

  1. A8
  2. B6
  3. C5
  4. D4

Correct answer

C. 5

Step-by-step solution

MO configuration of O ₂⁺ molecular ion : 1 s², ^ * s², 2 s², ^ * 2 s², 2 p_ x ², 2 p_ y ²= 2 p_ z ², * 2 p_ y ¹ Hence, number of antibonding electrons =2(1 s)+2(2 s)+1(2 p)=5

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