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Question

Which of the following complex ions is not expected to absorb visible light ?

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> AIPMT - 2010 Pre

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Solution

[Ni(CN)4]2
For the absorption of visible light, the presence of unpaired d-electrons is the necessity.

a) In [Ni(CN)4]2,Ni is present as Ni2+
Ni2+=[Ar]3d84s0
Therefore,


(pairing occurs because CN is a strong field ligand).
Since in [Ni(CN)4]2, no unpaired electron is present in d orbitals, it does not absorb visible light.


[Cr(NH3)6]3+Cr3+ = Have three unpaired electrons
[Fe(H2O)6]2+Fe2+ = Have four unpaired electrons
[Ni(H2O)6]2+Ni2+ = Have two unpaired electrons

Hence, option (a) is correct.

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