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Correct increasing order for the wavelen...

Correct increasing order for the wavelength of absorption in the visible region for the complexes of `Co^(3+)` is:

A

`[Co(NH_(3))_(6)]^(3+)lt[Co(en)_(3)]^(3+)lt[Co(H_(2)O)_(6)]^(3+)`

B

`[Co(en)_(3)]^(3+)lt[Co(NH_(3))_(6)]^(3+)lt[Co(H_(2)O)_(6)]^(3+)`

C

`[Co(H_(2)O)_(6)]^(3+)lt[Co(en)_(3)]^(3+)lt[Co(NH_(3))_(6)]^(3+)`

D

`[Co(H_(2)O)_(6)]^(3+)lt[Co(NH_(3))_(6)]^(3+)lt[Co(en)_(3)]^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
B
The increasing order for the wavelength of absorption in the visible region for the complexes of `Co^(3+)` is:-
`[Co(en)]^(3+)lt[Co(NH_(3))_(6)]^(3+)lt[Co(H_(2)O)_(6)]^(3+)`
As the spectro chemical series is:
`I^(-)ltBr^(-)ltSCN^(-)ltCl^(-)ltS^(2-)ltF^(-)ltOH^(-)ltC_(2)O_(4)^(3-)ltH_(2)OltNCS^(-)ltEDTA^(3+)ltNH_(3)ltenltCN^(-)ltCO`
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