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JEE Main20252 Apr 2025Evening ShiftChemistryCoordination CompoundsActual

The d-orbital electronic configuration of the complex among [ Co ( en )₃ ]³⁺, [ CoF ₆ ]³⁻ , [ Mn ( H ₂ O )₆ ]²⁺ and [ Zn ( H ₂ O )₆ ]²⁺ that has the highest CFSE is :

Options

  1. At₂^6 g_g^0
  2. Bt₂^6 e_g^4
  3. Ct_ 2 g ^3 e_g^2
  4. Dt₂^4 e_g^2

Correct answer

A. t₂^6 g_g^0

Step-by-step solution

In [ Co ( en )₃ ]⁺³ S.F.L. is present and hence highest value of CFSE In rest all complexes WFL is present hence CFSE will be low. [ Co ( en )₃ ]⁺³ Co ⁺³ and en (SFL) Co ⁺³ [ Ar ] 3 ~d ^6

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