The correct order of E0 M2+/M values with negative sign for the four succes

Question

The correct order of

E^{0} M^{2 +} / M

values with negative sign for the four successive elements Cr, Mn, Fe and Co is

Options:

A . Fe>Mn>Cr>Co

B . Cr>Mn>Fe>Co

C . Mn>Cr>Fe>Co

D . Cr>Fe>Mn>Co.

Answer: Option C
:
C

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

>

>

>

Co.

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