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The correct order of E(M^(2+)//M)^(@) va...

The correct order of `E_(M^(2+)//M)^(@)` values with negative sign for the four successive elements Cr, Mn, Fe and Co is

A

`Cr gt Mn gt Fe gt Co`

B

`Mn gt Cr gt Fe gt Co`

C

`Cr gt Fe gt Mn gt Co`

D

`Fe gt Mn gt Cr gt Co`

Text Solution

Verified by Experts

The correct Answer is:
B
`E_(Mn^2 // Mn)^(@) = -1.18 V , E_(Cr^(2+) // Cr)^(@) = -0.91 V`
`E_(Fe^(2+)//Fe)^(@) = - 0.44 V, E_(Co^(2+)//Co)^(@) = - 0.28 V`
`therefore` The correct order is `Mn gt Cr gt Fe gt Co`
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