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Which of the following redox reaction is...

Which of the following redox reaction is oxidation and which is reduction.
`(i)ZnrarrZn^(2+)+2e^(-)`
`(ii) CI_(2)+2e^(-)rarr2CI^(-)`
`(iii)FerarrFe^(2+)+2e^(-)`
`(iv)Sn^(4+)+2e^(-)rarrSn^(2+)`

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