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An oxidiser, also known as an oxidant or oxidising agent, is a reactant, a substance that takes part in and undergoes change during a reaction that draws electrons away from other reactants during a redox reaction. Any chemical reaction in which the oxidation numbers (oxidation states) of the atoms are changed is an oxidation-reduction reaction. Such reactions are also known as redox reactions, which is shorthand for reduction-oxidation reactions.Smith, Michael B.; March, Jerry (2007). Advanced Organic Chemistry: Reactions, Mechanisms, and Structure (6th ed.). New York: Wiley-Interscience. ISBN 0-471-72091-7.

Common oxidizing agents include: hydrogen peroxide, ozone, oxygen, potassium nitrate, and nitric acid are all oxidizing agents. All of the halogens are oxidizing agents (e.g., chlorine, bromine, fluorine).


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