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Question:

Which of the following complex ions has electrons that are symmetrically filled in both t2g and eg orbitals?

[CoF6]3−

[Co(NH3)6]2+

[Mn(CN)6]4−

[FeF6]3−

Solution:

[FeF6]3− has electrons that are symmetrically filled in both t2g and eg orbitals. F is a weak ligand. Hence, the complex will be high spin complex. Fe(III) has 3d5 as the outer electronic configuration which can also be written as t2g3eg2.