Explain the following:
(i) All the octahedral complexes of `Ni^(2+)` must be outer orbital complexes.
(ii) `[CoF_(6)]^(3-)` is paramgnetic but `[Co(CN)_(6)]^(3-)` is diamagnetic .

Options

A. paramagnetic and undergoes `sp^(3) d^(2)` hybridisation
B. diamagnetic and undergoes `d^(2) sp^(3)` hybridisation
C. paramagnetic and undergoes `sp^(3) d` hybridisation
D. diamagnetic and undergoes `sp^(3)` hybridisation .

Answer

A

Explanation

`[CoF_(6)]^(3-)` is paramagnetic .
`[CoF_(6)]^(3+)` :