CaO+HNO3

CuO+H2SO4 →

CaO+H2O

ZnO+HCl →

ZnO+NaOH →

CO2+Ca(OH)2 →

CO2+H2O →​

CaO + 2HNO₃ = Ca(NO₃)₂ + H₂O

CuO + H₂SO₄ = CuSO₄ + H₂O

CaO + H₂O = Ca(OH)₂

ZnO + 2HCl = ZnCl₂ + H₂O

ZnO + 2NaOH = Zn(OH)₂ + Na₂O

CO₂ + Ca(OH)₂ = CaCO₃ + H₂O

CO₂ + H₂O = H₂CO₃