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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 in oxidation state from ` =2 ` to ` 3` is easiest :

A

`Co`

B

`Mn`

C

`Fe`

D

`Cr`

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The correct Answer is:
D
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The E_(M^(3+)//M^(2+))^(@) values for Cr,Mn,Fe andCo are 0.41,+1.57,+0.77 and +1.97 V respectively .For which one of these metal the change in oxidation state from +2 to +3 is easiest:

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