Name the compound that gets oxidised in the following reaction: $4 Na + O_{2} \to 2 {Na}_{2} O$

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Solution

Oxidation
A process of oxidation involves the addition of oxygen or removal of electrons.
A substance is said to oxidised if it loses its electrons, or the oxidation state of the compound is increased.
Oxidation is the reverse of reduction.
In the reaction given:
$4 Na + O_{2} \to 2 {Na}_{2} O$
Oxygen is added to the sodium metal to forming Sodium oxide.
The oxidation state of sodium is changed from 0 to +1.
$\underset{O x i d a t i o n s t a t e}{} \underset{(0)}{4 N a} + \underset{}{O_{2}} \to \underset{(+ 1)}{2 N a_{2} O}$
Thus, the above two statements show that sodium is oxidized in the above reaction.

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