1.

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

Answer»

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

Solution :From spectrochemical SERIES, the ABILITY to CAUSE crystal field splitting decreases in the order en `gt NH_(3) gt H_(2)O`. As CFSE is inversely proportional to wavelength of absorption in the visible region `(E=(hc)/(lambda))`, THEREFORE, the correct increasing order for the wavelength of absorption for `Co^(3+)` complexes is.
`[Co(en)_(3)]^(3+)lt[Co(NH_(3))_(6)]^(3+)lt[Co(H_(2)O)_(6)]^(3+)`


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