The number of unpaired electrons in gaseous species of `Mn^(3+), Cr^(3+)` and `V^(3+)` respectively are………….and most stable species is…………..

Options

A. 4,3 and 2, `V^(3+)`
B. 3,3 and 2, `Cr^(3+)`
C. 4,3 and 2, `Cr^(3+)`
D. 3,3 and 3, `Mn^(3+)`

Answer

C

Explanation

`Mn^(3+)=3d^4=4` unpaired electrons, `Cr^(3+)=3d^3=3` unpaired electrons, `V^(3+)=3d^2=2` unpaired electrons. `Cr^(3+)` is most stable out of these in aqueous solution because it has half-filled `t_(2g)`level (i.e., `t_(2g)^(3))`.