1) Fe2O3 + 3C -> 2Fe + 3CO2Fe + 3H2SO4 -> Fe2(SO4)3 + 3H2Fe2(SO4)3 + 6NaOH -> 2Fe(OH)2 + 3Na2SO42Fe(OH)2 + 4HCl -> 2FeCl2 + 4H2O
2) Ca + O2 -> 2CaOCaO + 2HCl -> CaCl2 + H2OCaCl2 + Na2CO3 -> CaCO3 + 2NaClCaCO3 -> CaO + CO2CaO + H2O -> Ca(OH)2
3) Zn + O2 -> ZnOZnO + 2HCl -> ZnCl2 + H2OZnCl2 + 2NaOH -> Zn(OH)2 + 2NaClZn(OH)2 + H2SO4 -> ZnSO4 + 2H2O
1) Fe2O3 + 3C -> 2Fe + 3CO
2Fe + 3H2SO4 -> Fe2(SO4)3 + 3H2
Fe2(SO4)3 + 6NaOH -> 2Fe(OH)2 + 3Na2SO4
2Fe(OH)2 + 4HCl -> 2FeCl2 + 4H2O
2) Ca + O2 -> 2CaO
CaO + 2HCl -> CaCl2 + H2O
CaCl2 + Na2CO3 -> CaCO3 + 2NaCl
CaCO3 -> CaO + CO2
CaO + H2O -> Ca(OH)2
3) Zn + O2 -> ZnO
ZnO + 2HCl -> ZnCl2 + H2O
ZnCl2 + 2NaOH -> Zn(OH)2 + 2NaCl
Zn(OH)2 + H2SO4 -> ZnSO4 + 2H2O