The number of unpaired electrons calsulated in `[Co(NH_(3))_(3)]^(3+)` and `|CoF_(6)|^(3-)` are

Options

A. 4 and 4
B. 0 and 2
C. 2 and 4
D. 0 and 4

Answer

D

Explanation

`Co^(3+)`
`(d^(6))`

In`|Co(NH_(3))_(6)|^(3+)` , `NH_(3)` is a strong ligand d-electron pair up `:.` unpaired electron = 0
In `|FeF_(6)|^(3-), F^(-)` is a weak ligand , d-electrons do not pair up `:.` unpaired electron = 4