Practice question

MCQ

Question

Which complex exhibits a color due to a d-d transition involving eg orbitals?

Options

Choose one · Correct answer highlighted

[Ni(CN)4]2− [Co(CN)6]3− [Ni(H₂O)6]2+ Correct [Fe(CN)6]4−

Explanation

[Ni(H₂O)6]2+ (Ni₂+, d8) in an octahedral field has t2g6 eg2, and the d-d transition from t2g to eg absorbs visible light (green color).

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