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When degenerate d-orbitals of an isolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost. The two set \( t_{2 g}\left(d_{x y}, d_{y z}, d_{x z}\right) \) and eg \( \left(d_{z^{2}}, d_{x^{2}}-y^{2}\right) \) are either stabilized or destrabilized depending upon the nature of magnetic field. It can be expressed diagrammatically as:

Value of CFSE depends upon nature of ligand and a spectrochemical series has been made experimentally, for tetrahedral complexes, \( \Delta \) is about \( 4 / 9 \) times to \( \Delta_{O} \) (CFSE for octahedral complex). This energy lies - in visible region and i.e., why electronic transition are responsible for colour. Such transitions are not possible with \( d^{0} \) and \( d^{10} \) configuration.
The CFSE for \( \left[\mathrm{CoCl}_{6}\right]^{4-} \) complex is \( 18000 \mathrm{~cm}^{-1} \). The \( \Delta \) for \( \left[\mathrm{CoCl}_{4}\right]^{2-} \) will be -
(A) \( 18000 \mathrm{~cm}^{-1} \)
(B) \( 16000 \mathrm{~cm}^{-1} \)
(C) \( 8000 \mathrm{~cm}^{-1} \)
(D) \( 2000 \mathrm{~cm}^{-1} \)
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