1.

S+O2 (to)→SO2
2SO2+O2 (to,V2O5)−−−−→2SO3

SO3+H2O→H2SO4
2NaOH+H2SO4→Na2SO4+2H2O
Na2SO4+BaCl2→BaSO4+2NaCl

 2. 

SO2+ Na2O (t*)-> Na2SO3 

Na2SO3+ H2SO4 -> Na2SO4+ SO2+ H2O 

Na2SO4+ Ba(OH)2 -> BaSO4+ 2NaOH 

2NaOH+ CO2 -> Na2CO3+ H2O

4. 

2Fe+ 3Cl2 (t*)-> 2FeCl3 

FeCl3+ 3NaOH -> Fe(OH)3+ 3NaCl 

2Fe(OH)3 (t*)-> Fe2O3+ 3H2O 

Fe2O3+ 3H2SO4 -> Fe2(SO4)3+ 3H2O 

Fe2(SO4)3+ 3BaCl2 -> 3BaSO4+ 2FeCl3

5. 

Fe+2HCl→FeCl₂+H₂↑

Cu(NO₃)₂+FeCl₂→Fe(NO₃)₂+CuCl₂

Fe(NO₃)₂+NaOH→NaNO₃+Fe(OH)2 ↓

H₂SO₄+Fe(OH)₂→2H₂O+FeSO₄

_6. 

Cu+ 1/2 O2 (t*)-> CuO 

CuO+ 2HCl -> CuCl2+ H2O 

CuCl2+ 2NaOH -> Cu(OH)2+ 2NaCl 

Cu(OH)2 (t*)-> CuO+ H2O 

CuO+ H2 (t*)-> Cu+ H2O 

Cu+ 2H2SO4 (t*)-> CuSO4+ SO2+ 2H2O

7. 

Al2O3------>Al---------->AlCl3---------->-NaCl------------>NaOH--------->Cu(OH)2

Al2O3+3CO-------->2Al+3CO2(Có t độ)

2Al+6HCl--------->2AlCl3+3H2

AlCl3+3NaOH------->3NaCl+Al(OH)3

2NaCl+2H2O-------->2NaOH+H2+Cl2

2NaOH+CuCl2--------->2NaCl+Cu(OH)2

2SO2+O2 (to,V2O5)−−−−→2SO3 SO3+H2O→H2SO4 2NaOH+H2SO4→Na2SO4+2H2O Na2SO4+BaCl2→BaSO4+2NaCl  2.  SO2+ Na2O (t*)-> Na2SO3  Na2SO3+ H2SO4 -> Na2SO4+ SO2+ H2O  Na2SO4+ Ba(OH)2 -> BaSO4+ 2NaOH  2NaOH+ CO2 -> Na2CO3+ H2O 4.  2Fe+ 3Cl2 (t*)-> 2FeCl3  FeCl3+ 3NaOH -> Fe(OH)3+ 3NaCl  2Fe(OH)3 (t*)-> Fe2O3+ 3H2O  Fe2O3+ 3H2SO4 -> Fe2(SO4)3+ 3H2O  Fe2(SO4)3+ 3BaCl2 -> 3BaSO4+ 2FeCl3 5.  Fe+2HCl→FeCl2+H2↑ Cu(NO3)2+FeCl2→Fe(NO3)2+CuCl2 Fe(NO3)2+NaOH→NaNO3+Fe(OH)2 ↓ H2SO4+Fe(OH)2→2H2O+FeSO4 6.  Cu+ 1/2 O2 (t*)-> CuO  CuO+ 2HCl -> CuCl2+ H2O  CuCl2+ 2NaOH -> Cu(OH)2+ 2NaCl  Cu(OH)2 (t*)-> CuO+ H2O  CuO+ H2 (t*)-> Cu+ H2O  Cu+ 2H2SO4 (t*)-> CuSO4+ SO2+ 2H2O 7.  Al2O3------>Al---------->AlCl3---------->-NaCl------------>NaOH--------->Cu(OH)2 Al2O3+3CO-------->2Al+3CO2(Có t độ) 2Al+6HCl--------->2AlCl3+3H2 AlCl3+3NaOH------->3NaCl+Al(OH)3 2NaCl+2H2O-------->2NaOH+H2+Cl2 2NaOH+CuCl2--------->2NaCl+Cu(OH)2