Redox is a type of chemical reaction in which the oxidation states of a reactant change.Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a decrease in the oxidation state. There are two classes of redox reactions: Electron-transfer: Only one (usually) electron flows from the atom, ion or molecule being oxidized to the atom, ion, or molecule that is reduced.

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