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Choose oxidation reactions from the foll...

Choose oxidation reactions from the following and write them.
i) `Zn rarr Zn^(2+) + 2e^-`
ii) `Cl + 1e^- rarr Cl^-`
iii) `O_2 + 2e^- rarr O^(2-)`
iv) `Mg rarr Mg^(2+) + 2e^-`

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i) .Zn rarr Zn^(2+) + 2e^-.
iv) .Mg rarr Mg^(2+) + 2e^-.
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