1)
CuO + H2 = Cu + H2O
Cu + Cl2 = CuCl2
CuCl2 + 2NaOH = Cu(OH)2 + 2NaCl
Cu(OH)2 => CuO + H2O
CuO + H2 = Cu + H2O
2)
Al2O3+3H2 = 2Al + 3H2O
2Al + 6HCl = 2AlCl3 + 3H2
AlCl3+3KOH = Al(OH)3 + 3KCl
2Al(OH)3 => Al2O3 + 3H2O
Al2O3 + 2NaOH + 3H2O = 2Na[Al(OH)4]