2PH₃ + 4O₂ = P₂O₅ + 3H₂OCa(OH)₂ = CaO + H₂OPb(OH)₂ = PbO + H₂OBaCO₃ = BaO + CO₂↑FeCO₃ = FeO + CO₂↑K₂SiO₃ = SiO₂ + K₂OMgO + CO₂ = MgCO₃↓BaO + SO₂ = BaSO₃Li₂O + SO₃ = Li₂SO₄PbO + 2HNO₃ = Pb(NO₃)₂ + H₂OMgO + H₂SO₄ = MgSO₄ + H₂OZnO + 2HNO₃ = Zn(NO₃)₂ + H₂OK₂O + H₂S = K₂S + H₂OFeO + 2HNO₃ = Fe(NO₃)₂ + H₂O BaO + H₂CO₃ = BaCO₃↓ + H₂ONa₂O + 2HBr = 2NaBr + H₂OCaO + H₂CO₃ = CaCO₃↓ + H₂OPbO + 2HCl = PbCl₂ + H₂OCaO + H₂O = Ca(OH)₂Li₂O + H₂O = 2LiOH