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Identify the substances that are oxidise...

Identify the substances that are oxidised and the substances that are reduced in the following reactions.
(i) `4Na(s)+O_(2)(g)rarr2NaO(s)`
(ii) `CuO(g) +H_(2)(g) rarr Cu(s) +H_(2)O(l)`

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`H_(2)` is oxidised and CuO is reduced.
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