The correct order of $E^{0} M^{2 +} / M$ values with negative sign for the four successive elements Cr, Mn, Fe and Co is

Fe ›Mn›Cr›Co

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Cr›Mn›Fe›Co

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Mn›Cr›Fe›Co

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Cr›Fe›Mn›Co.

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Solution

The correct option is C Mn›Cr›Fe›Co
$E^{0}$ values of $M^{2 +} / M$ with negative sign are: Cr=-0.91V, Mn= -1.18V, Fe=-0.44V,Co= -0.28V. Thus, the order is Mn $>$ Cr $>$ Fe $>$ Co.

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