a)H2O
Na2O + H2O -> 2NaOH
BaO + H2O -> Ba(OH)2
b) dd HCl
2HCl + FeO -> FeCl2 + H2O
2HCl + CuO -> CuCl2 + H2O
2HCl + Na2O-> 2NaCl + H2O
2HCl + BaO -> BaCl2 + H2O
2HCl + ZnO -> ZnCl2 + H2O
2HCl + MgO -> MgCl2 + H2O
2HCl + CaO -> CaCl2 + H2O
c) NaOH
2NaOH + SO2 -> Na2SO3 + H2O
NaOH + SO2 -> NaHSO3
2NaOH + CO2 -> Na2CO3 + H2O
NaOH + CO2 -> NaHCO3
2NaOH + ZnO -> Na2ZnO2 + H2O
2NaOH + SiO2 -> Na2SiO3 + H2O