MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
In this reaction, the oxidation number of Mn changes from +4 in MnO 2 to +2 in MnCl 2 whereas the oxidation number of Cl changes from -1 in HCl to 0 in Cl2.
Therefore, MnO 2 is reduced to MnCl 2 and HCl is oxidized to Cl 2 .oxidised-HCl
reduced-MnO2
Oxidising agent-MnO2
Reducing agent-HCl