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

The correct order of `E _(m^(2+)//M)^(@)` values of which gnegative sign for the four sucessive elements Cr, Mn, Fe and Co is

A

`Mn gt Cr gt Fe gt Co`

B

`Cr gt Fe gt Mn gt Co`

C

`Fe gt Mn gt Cr gt Co`

D

`Cr gt Mn gt Fegt Co`

Text Solution

Verified by Experts

The correct Answer is:
A
The value of `E_(Mn^(2)//M) ^(@)` for given metal ions are
`E_(Mn^(2*)//Mn)* *1.18V.`
`E_(Cr^(2*)//Cr)^(@)* * 0.9V,`
`E_(Fe^(2*)//Fe)^(@)* *0.44V and E_(Ca^(2*)//Co)^(* *) 0.28V.`
The correct order of `E_(M^(2*)//M)^(@)` values without considering negative sign would be
`Mn^(2+)gt Cr^(2+) gtFe^(2+)gtCo^(2+)`
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