In that reaction, reduction has taken place when the oxidation number is reduced, resulting in Cl2 becoming Cl.
Oxidation is the process in which a reactant oxidises during a reaction. Reduction is the term used to describe a reaction in which a reactant picks up electrons. This happens frequently when acid and metals interact. Oxidation is the process in which a reactant oxidises during a reaction.
Oxidation occurs when an element, peptide, other ion loses one or maybe more electrons during one chemical reaction. While oxidation is happening, the oxidation status of the chemical species rises. Oxygen is not always required for oxidation to occur. The expression was first used to describe how oxygen caused significant ion transfer during a process.
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