The species having 4 or more unpaired electrons are:

Options

A. `Fe^(2+)`
B. `Co^(3+)`
C. `Mn^(2+)`
D. `Ni^(2+)`

Answer

A, B, C

Explanation

(a) `Fe^(2+)` is `d^(6)` (b) `Co^(3+)` is `d^(6)`
(c) `Mn^(2+)` is `d^(5)` (d) `Ni^(2+)` is `d^(8)`