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Question

The EoM3+/M2+ values for Cr, Mn, Fe and Co are −0.41, +1.57, +0.77 and +1.97 respectively. For which one of following metal the change in oxidation state from +2 to +3 is easiest?

A
Cr
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B
Mn
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C
Co
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D
None of these
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Solution

The correct option is A Cr
As we know,

EoOP=EoRP.

So, EoOP for Cr2+/Cr3+ is maximum +0.41 V.

So, Cr2+ will be easily oxidised to Cr3+.

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