Which of the following ions show higher spin only magnetic moment value?

Options

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

Answer

B, C

Explanation

`Ti^(3+) = [Ar]3d^(1)`
`Mn^(2+)=[Ar] 3d^(5), (t_(2g)^(3)e_(g)^(2))`
`Fe^(2+)=[Ar]3d^(6)(t_(2g)^(4)e_(2g)^(2))`
`Co^(3+)=[Ar] 3d^(6)(t_(2g)^(6)e_(g)^(0))`
Crystal field splitting energy (CFSE) is high in `Co^(3+)`, thus electrons pair up in `t_(2g)`. Hence, only `Fe^(2+)` and `Mn^(2+)` show higher spin magnetic moment value.