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KCET2011ChemistryChemical Bonding and Molecular Structure

When O ₂ is converted into O ₂⁺

Options

  1. Aboth paramagnetic character and bond order increase
  2. Bbond order decreases
  3. Cparamagnetic character increases
  4. Dparamagnetic character decreases and the bond order increases

Correct answer

D. paramagnetic character decreases and the bond order increases

Step-by-step solution

(i) O ₂-( 1 s)²( * 1 s)²( 2 s)² ( ^ * 2 s )² aligned & ( 2 p_ z )² ( 2 p_ x )² ( 2 p_ y )² ( * 2 p_ x )¹ & ( ^ * 2 p_ y )¹ aligned Bond order = N_ b -N_ a 2 = 8-4 2 =2 O ₂ molecule having 2 unpaired electron. (ii) O ₂⁺-( 1 s)² ( ^ * 1 s )²( 2 s)² ( ^ * 2 s )² aligned & ( 2 p_ z )² ( 2 p_ x )² ( 2 p_ y )² ( ^ * 2 p_ x )¹ & ( ^ * 2 p_ y )⁰ aligned Bond order = 8-3 2 =2.5 O ₂⁺ ion having only 1 unpaired electron. Hence, when O ₂ is converted into O ₂⁺ paramagnetic character decrease and the bond order increases.

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