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+)= 3d^(1) , Mn^(2+)= 3d^(5) , (t_(2g)^(3) e_(g)^(2)), Fe^(2+) = 3d^(6) ( t_(2g)^(4) e_(g)^(2)), Co^(3+) = 3d^(6) ( t_(2g)^(6) e_(g)^(0) ) `. In `Co^(3+)` , crystal field splitting energy (CFSE) is high and so electrons pair up in `t_(2g)` . Thus, only `Mn^(2+)` and `Fe^(2+)` show higher spin magnetic moment value.