The number of unpaired electrons in the complex ion `[CoF_6]^(3-)` is (Atomic no. of `Co=27`)

Options

A. (a) Zero
B. (b) `2`
C. (c) `3`
D. (d) `4`

Answer

D

Explanation

The number of unpaired electrons in the complex ion `[CoF_6]^(3-)` is 4, as `Co^(+3)` is `3d^6` and hybridization is `sp^3d^2`. So 4 unpaired `e^(-1)s` in `3d`.