a, 

FeCl2 $\buildrel{{đpdd}}\over\longrightarrow$ Fe+ Cl2 

2Fe+ 3Cl2 $\buildrel{{t^o}}\over\longrightarrow$ 2FeCl3 

FeCl3+ 3NaOH -> Fe(OH)3+ 3NaCl 

NaCl+ H2SO4 (đ) $\buildrel{{t^o}}\over\longrightarrow$ NaHSO4+ HCl 

CuO+ 2HCl -> CuCl2+ H2O 

CuCl2+ 2AgNO3 -> Cu(NO3)2+ 2AgCl 

b, 

MnO2+ 4HCl -> MnCl2+ Cl2+ 2H2O 

Cl2+ 2K -> 2KCl 

KCl+ H2SO4 (đ) $\buildrel{{t^o}}\over\longrightarrow$ KHSO4+ HCl 

AgNO3+ HCl -> AgCl+ HNO3 

c,

2KMnO4+ 16HCl -> 2KCl+ 2MnCl2+ 5Cl2+ 8H2O  

Cl2+ H2 $\buildrel{{as}}\over\longrightarrow$ 2HCl

NaOH+ HCl -> NaCl+ H2O 

2NaCl $\buildrel{{đpnc}}\over\longrightarrow$ 2Na+ Cl2 

Cl2+ 2KBr -> 2KCl+ Br2

Br2+ 2KI -> 2KBr+ I2 

2Al+ 3I2 $\buildrel{{t^o}}\over\longrightarrow$ 2AlI3

FeCl2→Cl2+Fe (Điện phân dd)

3Cl2+2Fe-->2FeCl3 (Nhiệt độ)

3NaOH+FeCl3→3NaCl+Fe(OH)3

H2SO4+2NaCl→2HCl+Na2SO4 (Nhiệt độ)

CuO+2HCl→H2O+CuCl2

2AgNO3+CuCl2→2AgCl+Cu(NO3)2  (Nhiệt độ)