MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryCoordination compoundsPrevious Year Questions
Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is (AIPMT 2014)
A.[Mn(H2O)6]
B.[Fe(H2O)6]✓ Correct
C.[Co(H2O)6]
D.[Co(H2O)6]
Explanation
H2O is a weak field ligand, Hence, O O Δ <pairing energy CFSE= -0.4x+0.6y Δ Where, x and y are number of electrons occupying t2g and eg orbitals respectively. For [Fe(H2O6]3+ the electronic configuration is (3d5) Therefore, = 3 2g t 2 ge = =-0.4×3+0.6×2 =0.0
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