Q.

The electron distribution in dn coordination complexes depends on magnitude of crystal field splitting, (0 ) and pairing energy (P). The condition which favours formation of high spin complexes is :

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a

t2g4eg0

b

Δo>P

c

Δo=P

d

Δo<P

answer is B.

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Detailed Solution

  • High spin complex means pairing does not occur. 
  • This condition is possible only in presence  of weak field ligands. 
  • In octahedral complexes energy of t2g< eg . 
  • In presence of weak field  ligand, electrons progressively enter to t2g until each of the three orbitals of t2g are half-filled  then fourth and fifth electrons enter into eg  levels are half filled. 
  • This condition is possible  when Δo<P.
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