CaO--Ca(NO3) Ca(OH)2--CaCl2
CaO+N2O5=Ca(NO3)2
Ca(OH)+2HCl=CaCl2+2H2O
CaO + 2HNO3 = Ca(NO3)2 + H2O Ca(OH)2 + 2HCl = CaCl2 + 2H2O