State the relationship between oxidation and oxidising agent in a redox reaction. Give an example of redox reaction showing the relationship between oxidation and oxidising agent.

Relation between oxidation and oxidising agent:
Addition of oxygen or removal of hydrogen is called oxidation.
The substance that brings about oxidation is called oxidising agent.
Example: Fe₂O₃ + 2Al ⟶A1₂O₃ + 2Fe
In this example, Fe₂O₃ has acted as oxidising agent and A1 has been oxidised.