Redox Reaction by Whatsapp Cikgu Kwee now! A redox reaction is a chemical reaction that involves reduction and oxidation that occurs simultaneously.In a redox reaction, both reduction and oxidation are going on side-by-side.Oxidation and reduction can be defined in terms ofloss or gain of oxygenloss or gain of hydrogentransfer of electronschange in oxidation numberThe redox reaction that you need to know in SPM includesRedox reaction in aqueous solutionchanging of iron(II) ions to ions(III) and vice versadisplacement of hydrogendisplacement of halogenstransfer of electrons at a distanceElectrochemistryCorrosion of metalsCombustion of metalsRusting of ironExtraction of metal Whatsapp Cikgu Kwee now!