S+O2=SO2. SO2+H2O=H2SO3. H2SO3+Na2O=Na2SO3+H2O
2Mg+O2=2MgO. MgO+2HCl=MgCl2+H2O. MgCl2+2NaOH=Mg(OH)2+2NaCl
Mg(OH)2+2NaNO3=Mg(NO3)2+2NaOH Mg(NO3)2+Na2SO4 =MgSO4+2NaNO3
C+O2=CO2. CO2+H2O=H2CO3
H2CO3+CaCl2=CaCO3+2HCl
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S+O2=SO2. SO2+H2O=H2SO3. H2SO3+Na2O=Na2SO3+H2O
2Mg+O2=2MgO. MgO+2HCl=MgCl2+H2O. MgCl2+2NaOH=Mg(OH)2+2NaCl
Mg(OH)2+2NaNO3=Mg(NO3)2+2NaOH Mg(NO3)2+Na2SO4 =MgSO4+2NaNO3
C+O2=CO2. CO2+H2O=H2CO3
H2CO3+CaCl2=CaCO3+2HCl