C-07-Q073mediumsingle_mcqCombustion of magnesium in oxygen gives—aMgO\mathrm{MgO}MgObMgCl2\mathrm{MgCl_2}MgCl2cMg(OH)2\mathrm{Mg(OH)_2}Mg(OH)2dMgCO3\mathrm{MgCO_3}MgCO3