As MnO₂ reacts with HCl to form salt, water and chlorine gas, it is basic oxide since it reacts with an acid. Moreover, oxides of metal are basic in nature whereas oxides of non-metals are acidic in nature.

Bleaching powder is produced by the action of chlorine on dry slaked lime. Ca(OH)₂ + Cl → CaOCl₂ + H₂O