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The wavelength of light absorbed is high...

The wavelength of light absorbed is highest in -

A

`[Co(NH_(3))_(5)Cl]^(2+)`

B

`[Co(NH_(3))_(5)H_(2)O]^(3+)`

C

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

D

`[Co(en)_(3)]^(2+)`

Text Solution

Verified by Experts

The correct Answer is:
A
In the complexes given, `Cl^(-)` is the weakest ligand. Hence, the energy gap between `t_(2g) and e_(g)` is minimum for `[Co(NH_(3))_(5)Cl_(2)]^(2+)`. So, for excitation, (A) requires light of minimum energy and maximum wavelenght.
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