In which of the following complex ion, the central metal ion is in a state of `sp^(3)d^(2)` hybridisation ?

Options

A. `[CoF_(6)]^(3-)`
B. `[Co(NH_(3))_(6)]^(3+)`
C. `[Fe(CN)_(6)]^(3-)`
D. `[Cr(NH_(3))_(6)]^(3+)`

Answer

A

Explanation

Electronic configurations of :

`F^(-)`, being a weak ligand cannot cause forcible pairing of electrons within d subshell and forms outer orbital octahedral complex.
`[Co(NH_(3))_(6)]^(3+)` ion :

`NH_(3)` and `CN^(-)` are strong ligands, so they form inner orbital octahedral complex.