Identify the oxidised and reduced substances in the following reaction:

$4 N a (s) + O_{2} (g) \to 2 N a_{2} O (s)$

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Solution

In the reaction above sodium is changing into sodium oxide. This is an addition of oxygen. Therefore sodium (Na) is oxidised.

Similarly, oxygen is changing into sodium oxide. This is an addition of metal sodium. Therefore oxygen is reduced.

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4 Na (s) + O_{2} (g) \to 2 {Na}_{2} O(s)

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