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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)`

Text Solution

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(i) In this reaction, sodium (Na) is changed into sodium oxide `(Na_(2)O)`. This is the addition of oxygen to sodium. Since addition of oxygen is called oxidation, therefore, the substance sodium (Na) is oxidised.
Oxygen `(O_(2))` is changed into `Na_(2)O`. Here, the addition of metal to oxygen takes place. So, the substance reduced is oxygen.
(ii) Here, copper oxide is reduced to copper metal whereas hydrogen is oxidised to water.
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