MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryCoordination compoundsPrevious Year Questions
Which of the following complex ion is not expected to absorb visible light? [CBSE AIPMT 2010]
A.[Ni(H2O)6]
B.[Ni(CN)4]✓ Correct
C.[Cr(NH3)6]
D.[Fe(H2O)6]
Explanation
The presence of unpaired d electron is necessary for the absorption of visible light. In [Ni(CN)4]2+, Ni is present as 2+ Ni . 2+ 8 0 Ni = Ar 3d 4s Here pairing occurs because - CN is a strong field ligand and as [Ni(CN)4]2– has no unpaired electron therefore it does not absorb visible light. Hence, the correct option is (b).
Practice More Like This
Take chapter-wise tests, track your progress, and master Coordination compounds.
Start Free Practice →