S + O2 ==点燃== SO22S + Cl2 ==△== S2Cl2；S2Cl2 + Cl2 ==△== 2SCl2S + Cl2 ==△== SCl22S2Cl2 + 2H2O = 4HCl + SO2↑ + 3S↓S2Cl2：Cl-S-S-Cl；S+1价,Cl-1价SCl2：Cl-S-Cl；S+2价,Cl-1价S + O2 ==��ȼ== SO2����������������