Question

Fe+FeCl3=Fe(OH)3=Fe2O3=Fe2(SO4)3=Fe
Cl2=HCl=FeCl3=Fe(OH)3=Fe2O3=Fe2(SO4)3
Br2=KBr=AgBr=Ag=NO2=HNO3

Answer 1

2Fe + 3Cl₂=2FeCl₃
FeCl₃ + 3KOH=Fe(OH)₃ + 3KCl
2Fe(OH)₂=Fe2O₃ + 3H₂O
Fe2O₃ + 3H₂=2Fe + 3H₂O
Fe2O₃ + 3H₂=2Fe + 3H₂O

Answer 2

1) 2Fe+3Cl₂--->2FeCl₃
FeCl₃+3NaOH--->Fe(OH)₃+3NaOH
2Fe(OH)₃-->Fe₂O₃+3H₂O
Fe₂O₃+3H₂SO₄-->Fe₂(SO₄)₃+3H₂O
Fe₂(SO₄)₃+2Al-->Al₂(SO₄)₃+2Fe
2) Cl₂+H₂-->2HCl
Fe₂O₃+6HCl-->2FeCl₃+3H₂O
FeCl₃+3NaOH-->Fe(OH)₃+3NaCl
2Fe(OH)₃-->Fe₂O₃+3H₂O
Fe₂O₃+3H₂SO₄-->Fe₂(SO₄)₃+3H₂O
3) 2K+Br₂-->2KBr
KBr+AgNO₃-->AgBr+KNO₃
AgBr-->Ag+Br
Ag+2HNO₃-->AgNO₃+NO₂+H₂O
4NO₂+2H₂O+O₂-->4HNO₃