1. Fe + 2HCl = FeCl2 + H2
FeCl2 + 2NaOH = Fe(OH)2 + 2NaCl
Fe(OH)2 (t)= FeO + H2O
2FeO (t)= 2Fe + O2
2Fe + 3Cl2 = 2FeCl3
FeCl3 + 3KOH = Fe(OH)3 + 3KCl
Fe(OH)3 + 3HNO3 = Fe(NO3)3 + 3H2O
2. 2Al + 3H2SO4 = Al2(SO4)3 + 3H2
Al2(SO4)3 + 6KOH = 2Al(OH)3 + 3K2SO4
Al(OH)3 + NaOH = Na[Al(OH)4].