3. Identify the substances that are oxidised and the substances
that are reduced in the following reactions.
(i) 4Na(s) + O2
(g) → 2Na2O(s)
(ii) CuO(s) + H2
(g) → Cu(s) + H2O(l)
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Answer:
The substance that added with oxygen is said to be oxidized whereas removal of oxygen is called as reduction and the substance is said to be reduced.
So, we need to check the addition of oxygen or removal of oxygen to check the oxidation and reduction.
(i) Na changes to Na_2ONa
2
O . Hence, oxygen added so here Na oxidized and O_2O
2
reduced.
(ii) CuO changes to Cu hence oxygen is removed from CuO. Hence, CuO is reduced and H_2H
2
is oxidized.
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answer is sodium
it's the correct answer