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Which of the following complex ions is e...

Which of the following complex ions is expected to absorb visible light?

A

`[Sc(H_(2)O)_(6)]^(3+)`

B

`[Ti(en)_(2)(NH_(3))_(2)]^(4+)`

C

`[Cr(CN)_(6)]^(3-)`

D

`[Co(NH_(3))_(6)]^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
3
In `[Cr(CN)_(5)]^(3-),Cr`is present as `Cr^(3+)`.
`Cr^(3+)=[Ar]3d^(3),4s^(0)`
`[Cr(CN)_(6)]^(3-)=[Ar]`
Since, this complex has three unpaired electrons, excitation of electrons is possible and thus, it is expected that this complex will absorb visible light.
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RESONANCE-COORDINATION COMPOUNDS-Additional Problem for Self Practice (APSP) Part-IV Practice Test -2 (Section-5) (Matching Lift type )
  1. Which of the following complex ions is expected to absorb visible ligh...

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  2. Column-I and Column-II contains four entries each. Entries of Column-I...

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