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According to crystal filed theory , five...

According to crystal filed theory , five d-orbitals of an octahedral complex split to give

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Electrons in the d-orbitals of the central metal ion will be repelled by the lone pairs of the ligand. Because of these interactions the de-generacy of d-orbitals of the metal ion is lost and these split into two sets of orbitals having different energies. This is known as crystal field splitting.
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