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Which one is not called a anode reaction...

Which one is not called a anode reaction from the following
`Cl^(-)rarr(1)/(2)Cl_(2)+e^(-)`
`Zn rarr Zn^(2+)+2e^(-)`
`Cu^(2+)+2e^(-)rarr Cu`
`Ni rarr Ni^(2+)+2e^(-)`

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