1)MgO+2HCl=MgCl2 +H2O
2)Na2O+H2O=2NaOH
NaOH + H2SO4=Na2SO4+H2O
3)2Ca+O2=2CaO
CaO+H2O=Ca (OH)2
Ca(OH)2 + CO2=CaCO3+H2O
4) S+O2=SO2
SO2+K2O=K2SO3
1)MgO+2HCl=MgCl2 +H2O
2)Na2O+H2O=2NaOH
NaOH + H2SO4=Na2SO4+H2O
3)2Ca+O2=2CaO
CaO+H2O=Ca (OH)2
Ca(OH)2 + CO2=CaCO3+H2O
4) S+O2=SO2
SO2+K2O=K2SO3