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State which of the following are oxidati...

State which of the following are oxidation reactions and which are reduction reactions:
[i] `CurarrCu^(2+)+2e^(-)` [ii] `Cu^(2+)+2e^(-)rarrCu` [iii] `Sn^(4+)+2e^(-)rarrSn^(2+)` [iv] `2Cl^(-)rarrCl_(2)+2e^(-)` [v] `Fe^(2+)rarrFe^(3+)+1e^(-)` [vi] `X+2e^(-)rarrX^(2-)` [vii] `Y-1e^(-)rarrY^(1+)` [viii] `Z^(3+)+1e^(-)rarrZ^(2+)`

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