Chemistry Laboratory Preparation of Chlorine It is prepared by the oxidation of conc. HCL with MnO2 4HCL(aq) + MnO2(s) → MnCL2(aq) + 2H2O + CL2 Industrially, it can be prepared by the electrolysis of concentrated sodium chloride (brine). ← Previous Chlorine Next → Physical Properties of Chloride Leave a comment Cancel replyYou must be logged in to post a comment.