What is the meaning of this statement
"Hydrogen chloride can be oxidised to chlorine"
Provide an example if possible

Dear student

Addition of oxygen or removal of hydrogen from the reactants is oxidation.

In the reaction below, on addition of oxygen, hydrogen is being removed from hydrochloric acid  and chlorine is formed.

Hydrogen chloride can be oxidised to chlorine by the Deacon process:
4HCl(g) + O2(g) --> 2Cl2(g) + 2H2O(g)

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