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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, +1.567, 0.77 and +1.97V` respectively. For which one of these metals the change in oxidation state from `+2` to `+3` is easiest?

A

Cr

B

Mn

C

Fe

D

Co

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The correct Answer is:
A
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