1.

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

Answer»

`Cu(Z= 29)`
`Fe(Z= 26)`
`Co( Z=27)`
`Ni(Z= 28)`

Solution :COPPER does not liberate `H_(2)` gas from acidsand thus shows positive valueof `E^(@) ( E^(@) ` for `Cu^(2+)//Cu`is `+0.34V)`. For other metals, `E^(@)` value is NEGATIVE.


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