The compsition of carnalite is

During the electrolysis of fused carnalite, MgCl_(2) is decomposed to liberate Mg at cathode and not KCl to liberate the K at cathode. This is because of:

Match the following choosing one item from Column X the appropriate item from Column Y. {:("Column X","Column Y"),(a."Al",p. "Calamine"),(B."Cu",q. "Cryolite"),(C."Mg",r. "Malachite"),(D. "Zn",s."Carnalite"):}