The values of `E_(M^(3+)//M^(2+))^(o)` of metals Cr, Mn, Fe and Co are -0.41, 0.57, +0.77 and +1.97 respectively. Then whose oxidation state easily converted into +2 to +3 ?

Options

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

Answer

A

Explanation

The metal which has less reduction potential value will easily converted into +2 to +3.
`Cr^(2+) to Cr^(3+) +e^(-)E_(Cr^(3+)//Cr^(2+))^(@)=-0.41V` Minimum
`Co^(2+)toCo^(3+)+e^(-) E_(Co^(3+)//Co^(2+))^(@)=1.97V` Maximum.