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Choose the reducation reactions from the...

Choose the reducation reactions from the following and write them
i) `Zn rarr Zn^(+2) + 2e^-`
ii) `Zn^(+2) + 2e^- rarr Zn`
iii) `Cu rarr Cu^(+2) + 2e^-`
iv) `Cu^(+2) + 2e^- rarr Cu`

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ii) .Zn^(+2) + 2e^- rarr Zn.
iv) .Cu^(+2) + 2e^- rarr Cu.
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