HCl+Zn= HCl+CaO= HCl+NaOH= HCl+Na2CO3=
2HCl+Zn= ZnCl2 + H2 2HCl+CaO= CaCl2 + H2O HCl+NaOH=NaCl + H2O 2HCl+Na2CO3=2NaCl + CO2 + H2O