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The E(M^(3+)//M^(2+)^@ values for Cr, ...

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 :

A

`Fe`

B

`Mn`

C

`Cr`

D

`Co`

Text Solution

Verified by Experts

The correct Answer is:
C
Lower the reduction potential or higher the oxidiation potential more easily it can be oxidised. Here, for `Cr^(2+)//Cr^(+3)`. The oxidation potential is maximum, so for `Cr` the change in oxidation state from `+2` to `+3` is easiest.
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