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1 Redox reactions may involve the transfer of electrons between chemical species. 2  The reaction that occurs when In which I 2 is reduced to I-and S 2 O 3 2- (thiosulfate anion) is oxidized to S 4 O 6 2- provides an example of a redox reaction :
Redox reactions, or oxidation-reduction reactions, have a number of similarities to acidâbase reactions. Like acidâbase reactions, redox reactions are a matched set, that is, there cannot be an oxidation reaction without a reduction reaction happening simultaneously.ecause there is no net change in charge during a redox reaction, the number of electrons in excess in the oxidation reaction must equal the number consumed by the reduction reaction (as shown above). Elements, even in molecular form, always have an oxidation state of zero.