a. NaCl → Cl2 → FeCl3 → NaCl → HCl → CuCl2 → AgCl.
2NaCl+2H2O-đp\mn->2NaOH+H2+Cl2
3Cl2+2Fe-to>2FeCl3
FeCl3+3NaOH->3NaCl+Fe(OH)3
2NaCl+H2SO4-to>Na2SO4+2HCl
2HCl+CuO->CuCl2+H2O
CuCl2+2AgNO3->2AgCl+Cu(NO3)2
b. CaCO3 → CaCl2 → NaCl → NaOH → NaClO → NaCl → Cl2 → FeCl3 → AgCl
CaCO3+2HCl->CaCl2+H2O+CO2
CaCl2+Na2CO3->2NaCl+CaCO3
2NaCl+2H2o-đp->2NaOH+Cl2+H2
2NaOH+Cl2-to>NaCl+NaClO+H2O
2NaClO-to->2NaCl+O2
2NaCl+2H2O-đp\mn->2NaOH+H2+Cl2
3Cl2+2Fe-to>2FeCl3
FeCl3+3AgNO3->3AgCl+Fe(NO3)3