The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light of the visible region, for the complexes, `[Co(NH_(3)_(6)]^(3+). [Co(CN)_(6)]^(3+). [Co(H_(2)O)_(6)]^(3+)`

Options

A. `[Co)CN)_(6)]^(3-) gt [Co(NH_(3))_(6)]^(3+) gt [Co(H_(2)O)_(6)]^(3+)`
B. `[Co(NH_(3))_(6)]^(3+) gt [Co(H_(2)O)_(6)]^(3+) gt [Co(CN)_(6)]^(3-)`
C. `[CoH_(2)O)_(6)]^(3+) gt Co(NH_(3))_(6)]^(3+) gt [Co(CN)_(6)]^(3-)`
D. `[Co(CN)_(6)]^(3-) gt [Co(NH_(3))_()]^(3+) gt [Co(H_(2)O)_(6)]^(3+)`

Answer

C

Explanation

all are octahedral complexes of `Co^(3-)` ion. The order of absorption of wavelength of light by different ligands is according to spectrochemical series.