1.

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

Answer»

`CO(Z=27)`
NI(Z=28)
Cu(Z=29)
Fe(Z=26)

Solution :`E_(Cu^(+2)//Cu)^(@)=0.34V`
other has `-veE_(E.R.)^(@)`
`E_(Co^(2+)//Co)^(@)=-0.28V`
`E_(Ni^(2+)//Ni)^(@)=-0.25`V
`E_(Fe^(2+)//Fe)^(@)=-0.44V`


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