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H2SO4+Ca(OH)2-->CaSO4+2H2O
CaO+H2O-->Ca(OH)2
H2+Cl2--->2HCl
HCl+NaOH--->NaCl+H2O
2Ca+O2-->2CaO
2KOH+H2CO3-->K2CO3+2H2O
2SO2+O2-->2SO3
K2O+H2O--->2KOH
SO3+H2O---> H2SO4
2H2+O2-->2H2O
Ca(OH)2+2HCl--->CaCl2+2H2O
4Fe+3O2-->2Fe2O3
SO2+H2O--->H2SO3
CO2+H2O-->H2CO3
S+H2-->H2S
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H2SO4+Ca(OH)2-->CaSO4+2H2O
CaO+H2O-->Ca(OH)2
H2+Cl2--->2HCl
HCl+NaOH--->NaCl+H2O
2Ca+O2-->2CaO
2KOH+H2CO3-->K2CO3+2H2O
2SO2+O2-->2SO3
K2O+H2O--->2KOH
SO3+H2O---> H2SO4
2H2+O2-->2H2O
Ca(OH)2+2HCl--->CaCl2+2H2O
4Fe+3O2-->2Fe2O3
SO2+H2O--->H2SO3
CO2+H2O-->H2CO3
S+H2-->H2S