The maximum oxidation state shown by `V(Z=23),Cr(Z=24),Co(Z=27),Sc(Z=21)`, are respectively

Options

A. `+5,+5,+3,+2`
B. `+5,+6,+3,+3`
C. `+5,+4,+5,+2`
D. `+5,+3,+2,+1`

Answer

2

Explanation

Electronic configuration of`" "V=[Ar]3d^(3)4s^(2)" "+5`
Electronic configuration of `" "Cr=[Ar]3d^(5)4s^(1)" "+6`
Electronic configuration of `" Co=[Ar]3d^(7)4s^(2)" "+3`
Half filled`t_(2g)^(6)` has higher CFSE and thus `+3` O.S. is stable
Electronic configuration of `Sc=[Ar]3d^(1)4s^(2)" "+3`