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Question
A solution of [Ni(H2O)6]2+ is green, but a solution of [Ni(CO)4] is colourless. Explain.
[Atomic number: Ni = 28]
Solution
H2O is a weak field ligand in [Ni(H2O)6]2+. As a result, Ni2+ has unpaired electrons. In this compound, d-electrons from the lower energy level can be stimulated to the higher energy level, implying that a d-d transition is possible. As a result, [Ni(H2O)6]2+ appears green, whereas [Ni(CO)4] is colourless due to the absence of an unpaired electron in the complex. CO is a strong field ligand that produces electron pairing.
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