C-10-Q033mediumsingle_mcq2ZnS+3O2→?\mathrm{2ZnS + 3O_2 \to ?}2ZnS+3O2→?a2ZnO+2SO2\mathrm{2ZnO + 2SO_2}2ZnO+2SO2bZnO+SO3\mathrm{ZnO + SO_3}