Răspuns:
Fe+HCl》H2+FeCl3
Sn+HCl》H2+SnCl
Fe+H2O》H2 + Fe2O3
Na+H2O》H2+NaO
Mg+FeSO4》Fe+MgSO4
Fe+CuSO4》Cu+Fe2(SO4)3
Cu+AgNO3》CuNO3+Ag
Pb+AlCl3》PbCl+Al
Al+Fe2O3》Fe+Al2O3
