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+)` is most stable
B. 3, 3 and 2, `Cr^(3+)` is most stable
C. 4, 3 and 2 , `Cr^(3+)` is most stable
D. 3, 3 and 3, `Mn^(3+)` is most stable

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`)