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JEE Main201912 Apr 2019Morning ShiftChemistryCoordination CompoundsActual

The complex ion that will lose its crystal field stabilization energy upon oxidation of metal to + 3 state is:

Options

  1. ANi p h e n 3 2 +
  2. BF e p h e n 3 2 +
  3. CC o p h e n 3 2 +
  4. DZn p h e n 3 2 +

Correct answer

B. F e p h e n 3 2 +

Step-by-step solution

F e + 2 A r 3 d 6 → F e + 3 A r 3 d 5 C F S E = 6 × - 0.4 Δ 0 = - 2.4 Δ 0 C F S E = - 2.0 Δ 0 In all other cases, the electron is removed from e g orbital and is hence, this will lead to decrease in pairing energy.

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