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Q.

The EM3+/M2+o 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:

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a

Co

b

Mn

c

Fe

d

Cr

answer is D.

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Detailed Solution

More is ERPo, more is the tendency to get reduced or lesser is tendency to get oxidsed. ERPCr3+/Cr2+o is maximum among all.
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