H2SO4+Mg=MgSO4+H2 2HCl+Cu=CuCl2+H2 2HCl+Zn=ZnCl2+H2 H2SO4+MgO=MgSO4+H2O NaOH+CO2=NaHCO3 3KOH+HPO4=KPO4+3H2O HCl+NaCO3=HCO3+NaCl HCl+NaNO3=реакции нет