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The correct order of `E_(M^(2+)//M)^(@)` Values with negative sign for the four successive elements `Cr, Mn, Fe` and `Co` is:
A. `Fe gt Mn gt Cr gt Co`
B. `Cr gt Mn gt Fe gt Co`
C. `Mn gt Cr gt Fe gt Co`
D. `Cr gt Fe gt Mn gt Co`

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Best answer
Correct Answer - C
`E^(@)` values of for `M^(2+)|M` with negative sign are
`Cr = -0.9 V ,Mn = -1.18 V , Fe = -0.44 V, ` Co = -28 V
Thus order is `Mn gt Cr gt Fe gt Co`

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