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The correct order of $E_{M^{2 +} / M}^{o}$ values with negative sign for the four successive elements Cr, Mn, Fe and Co is

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$Fe > Mn > Cr > Co$

$Cr > Mn > Fe > Co$

$Cr > Fe > Mn > Co$

$Mn > Cr > Fe > Co$

answer is C.

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Detailed Solution

Usually across the first transition series, the negative values for standard electrode potential decrease except for Mn due to stable d5-configuration.
The electronic configuration of various elements in Mn²⁺ state is:

Cr- [Ar] 3d⁴

Mn-Cr- [Ar] 3d⁵ -half filled- most stable.

Fe-Cr- [Ar] 3d⁶

Co-Cr- [Ar] 3d⁷

So, based on above facts the correct order is: Mn> Cr> Fe> Co.

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