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Question

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

A

B

C

D

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Text SolutionText solutionverified iconVerified

Key Idea For the absorption of visible light presence of unpaired d-electrons is the necessity.
(a) In , Ni is peresent as


Solution Image
(Pairing occurs because is a strong field ligand). Since in , no unpaired electron is present in d-orbitals so it does not absorb visilble light.
(b) In , Cr is present as
(Three unpaired electrons)
(c) In , Fe is present as .
(Four unpaired electrons)
(d) In Ni is present as
(Two paired electrons)
The complex given in option (b), (c), (d) have unpaired electrons, thus absorb visible light.
In presence of pairing does not occur as they are strong field ligand.
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Question Text
Which of the following complex ion is not expected to absorb visible light?
Answer TypeText solution:1
Upvotes150