C-09-Q061mediumsingle_mcqMg(OH)2+2HCl→?\mathrm{Mg(OH)_2 + 2HCl \to ?}Mg(OH)2+2HCl→?aMgCl2+2H2O\mathrm{MgCl_2 + 2H_2O}MgCl2+2H2Ob