Question

In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of `Delta_o` be the highest?
A. `[Co(NH_(3))_(6)]^(3+)`
B. `[Co(CN)_(6)]^(3-)`
C. `[Co(C_(2)O_(4))_(3)]^(3-)`
D. `[Co(H_(2)O)_(6)]^(3+)`

Answer 1

Correct Answer - B
Since `CN^(-)` is a very strong field ligand `Delta_("oct")` will be maximum for the complex.