Question

Hydrated magnesium chloride becomes anhydrous salt when it is heated:

• A. with $P_4{O}_{10}$
• B. with anhydrous $CaC{l}_2$
• C. in dry $HCl$ gas
• D. with conc. $H_{2}S{O}_4$

Answer 1

Answer: (C)

in dry $HCl$ gas

Anhydrous magnesium chloride can be prepared by heating $MgC{l}_2.2H_{2}O$ in presence of dry HCl gas.