Question 3.1
Identify the substance that is oxidized and the substance that is reduced in the following reaction:

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

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Solution

A substance is said to be oxidised if it gains oxygen and it is said to be reduced if it loses oxygen. In the given reaction, sodium (Na) is oxidized and oxygen is reduced.

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