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The $E_{M^{3 +}}^{\circ} 1 M^{2 +}$ values for Cr, Mn, Fe and Co are $- 0.41, + 1.57 V, + 0.77 and + 1.97 V$ respectively.
For wihch one of these metals the change in oxidation sate from + 2 to + 3 is easiest?

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answer is D.

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Detailed Solution

More negative value of $E_{r e d}^{o}$ indicates better reducing agent, thus easily oxidised.

Thus, The given vlaues indicates that the oxidation of Cr²⁺ to Cr³⁺ is the easiest.

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