What is a redox concept? Give an example.

Explanation

Oxidation is the increase in oxidation number of the given species while the reduction is decrease in the oxidation number of the gives species in a reaction. A chemical reaction in which both oxidation and reduction takes place simultaneously is called redox reaction.
e.g. : `Na+1/2Cl_(2)toNaCl`
In the above reaction oxidation number of sodium increases from 0 to +1 while the oxidation number of chlorine decreases from 0 to -1. So sodium is oxidised and chlorine is reduced.