1.
PbO2+4HCl（浓）=PbCl2+Cl2↑+2H2O【类似于二氧化锰的反应】
2.
2HCl+Na2S2O3=S↓+SO2↑+2NaCl+H2O【S2O3 2-不稳定,酸性条件下会歧化】
3.
HCl（浓）+HClO=Cl2↑+H2O【HClO强氧化性,浓HCl强还原性.归中反应】
4.
2NaCl+H2SO4（浓）=[强热]=Na2SO4+2HCl↑
【其实如果不加热或者达不到强热,就是NaCl+H2SO4（浓）=NaHSO4+HCl,加强热相当于在此基础上又发生了NaHSO4+NaCl=加热=Na2SO4+HCl↑,总反应即为上面所写】
5.
NaHSO4+NaCl=加热=Na2SO4+HCl↑
6.
MnO2+2H2SO4+2NaCl=加热=Na2SO4+MnSO4+Cl2↑
7.
2CH2=CH2+O2——催化剂（Ag）、△——→2CH2-CH2【生成环氧乙烷】
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