CO2 + KOH = BaO + H2SO4= AL2O3 + NaOH= AL2O3 + HCl=
BaO+H2SO4=BaSO4+H2O Al2O3+NaOH=NaAlO2+H2O Al2O3+HCl=AlCl3+H2O
CO2+KOH=KCO3+H2