a,
MnO2+ 4HCl -> MnCl2+ Cl2+ 2H2O
2Na+ Cl2 $\buildrel{{t^o}}\over\longrightarrow$ 2NaCl
2NaCl $\buildrel{{đpnc}}\over\longrightarrow$ 2Na+ Cl2
CaO+ Cl2 $\buildrel{{t^o}}\over\longrightarrow$ CaOCl2
Cl2+ 2NaOH -> NaCl+ NaClO+ H2O
Cl2+ H2 $\buildrel{{t^o}}\over\longrightarrow$ 2HCl
AgNO3+ HCl -> AgCl+ HNO3
b,
2KMnO4+ 16HCl -> 2KCl+ 2MnCl2+ 5Cl2+ 8H2O
2Fe+ 3Cl2 $\buildrel{{t^o}}\over\longrightarrow$ 2FeCl3
Cl2+ 2KBr -> 2KCl+ Br2
2Fe+ 3Br2 $\buildrel{{t^o}}\over\longrightarrow$ 2FeBr3
Br2+ 2KI -> 2KBr+ I2
Fe+ I2 $\buildrel{{t^o}}\over\longrightarrow$ FeI2
2Na+ I2 $\buildrel{{t^o}}\over\longrightarrow$ 2NaI
c,
MnO2+ 4HCl -> MnCl2+ Cl2+ 2H2O
2K+ Cl2 $\buildrel{{t^o}}\over\longrightarrow$ 2KCl
2KCl $\buildrel{{t^o}}\over\longrightarrow$ 2K+ Cl2
Cl2+ 2NaI -> 2NaCl+ I2
Cl2+ H2O $\rightleftharpoons$ HCl+ HClO
