The `E_(M^(3+)//M^(2+)^@` values for ` Cr`, Mn, Fe and ` Co` are ` 0.41, + 1.57 , + 0.77` and `+1, 97 V` respectively. For which one of these metals the change ub oxidation state from ` =2 ` to ` 3` is easiest :

Options

A. Cr
B. Mn
C. `Fe`
D. `Co`

Answer

A

Explanation

`Cr^(2+)|Cr^(3+)=+0.41V" " Mn^(2+)|Mn^(3+)=-1.57V`
`Fe^(2+)|Fe^(3+)=0.77V" "Co^(2+)|Co^(3+)=-1.97V`
As `Cr` will have maximum oxidation potential value, therefore is oxidation will be easiest.