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Which of the following complex ions has electrons that are symmetrically filled in both t 2 g and e g orbitals?

Options

  1. AC o N H 3 6 2 +
  2. BM n C N 6 4 -
  3. CC o F 6 3 -
  4. DF e F 6 3 -

Correct answer

D. F e F 6 3 -

Step-by-step solution

Metal ion having either d 5   or   d 10 configuration can be filled symmetrically in both t 2 g   and   e g orbitals. Co + 2 has d 7 configuration, Co + 3 has d 6 configuration. Mn + 2 has d 5 configuration but CN - is strong field ligand and it will pair the electrons due to which electronic configuration is t 2 g 5 e g 0 . As F is weak field ligand hence back pairing of electrons do not take place or in case of weak field ligand pairing energy of electrons (P )is greater than crystal field spl

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