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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

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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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(i) Sodium (Na) is oxidised as it gains oxygen and oxygen gets reduced
(ii) Copper oxide (CuO) is reduced to copper (Cu) while hydrogen `(H_(2))` gets oxidised to water `(H_(2)O)`
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