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Four successive members of the first ser...

Four successive members of the first series of transition metals are listed below. For which one of the of standard potential `(E_(M^(2+)//M)^(@))` value has a positive sign ?

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`E_(Cu^(2+)//Cu)^(@) = 0.34` volt
other has `-ve E_(R.P)^(@)`
`E_(Co^(2+)//Co)^(@) = -0.28`
`E_(Ni^(2+)//Ni)^(@) = -0.25`
`E_(Fe^(2+)//Fe)^(@) = -0.44`
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