Practice question
Question
Which complex would turn colorless if all its ligands were replaced by CN−?
Explanation
[Ni(H₂O)6]2+ (Ni₂+, d8) is colored (green) due to d-d transitions with weak field H₂O. With strong field CN− (e.g., [Ni(CN)6]4−), it becomes low spin (diamagnetic), no d-d transitions, colorless.
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