The species having 4 or more unpaired electrons are

Options

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

Answer

ABC

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)`