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Identify the substance that are oxidised...

Identify the substance that are oxidised and the substances that are redured in the following reactions.
(i) `4Na(S)+O_(2)(g)rarr2Na_(2)O(S)`
(ii) `CuO(S)+H_(2)(g)rarrCu(S)+H_(2)O(l)`

Text Solution

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(i) Sodium is losing the electrons to oxygen, so it is oxidised. Oxygen is gaining the electrons, so it is reduced.
(ii) `H_(2)` is oxidised into water.
CuO is reduced to Cu metal.
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