The \( \mathrm{E}^{0} \mathrm{M}^{3+} / \mathrm{M}^{2+} \) values f...

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The \( \mathrm{E}^{0} \mathrm{M}^{3+} / \mathrm{M}^{2+} \) values for \( \mathrm{Cr}, \mathrm{Mn}, \mathrm{Fe} \) and \( \mathrm{Co} \) are \( -0.41,+1.57,+0.77 \) and \( +1.97 \mathrm{~V} \) respectively. For which one of these metals the change in oxidation state from \( +2 \) to \( +3 \) is easiest?
(A) Co
(B) Mn
(C) \( \mathrm{Fe} \)
(D) \( \mathrm{Cr} \)
\( \mathrm{P} \)
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