1.

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

Answer»

`MN gt Cr gt Fe gt Co`
`Cr gt Fe gt Mn gt Co`
`Fe gt Mn gt Cr gt Co`
`Cr gt Mn gt Fegt Co`

Solution :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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