1)4H2O+3Fe=Fe3O4+4H2
H2+2NaCl=2HCL+2Na
2)H2+Cl2=2HCl
2HCl+MgCO3=MgCl2+H2O+CO2
MgCl2+2NaOH=2NaCl+Mg(OH)2↓
1)4H2O+3Fe=Fe3O4+4H2
H2+2NaCl=2HCL+2Na
2)H2+Cl2=2HCl
2HCl+MgCO3=MgCl2+H2O+CO2
MgCl2+2NaOH=2NaCl+Mg(OH)2↓