Identify the substance that is oxidized the substance that is reduced :
MnO2 + 4HCl - MnCl2 + 2H2O+Cl2
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Solution
In the reaction, MnO2+ 4HCl - MnCl2+ 2H2O+Cl2
HCl losing hydrogen and forming chlorine gas so it is getting oxidised and manganese dioxide loses oxygen and converting into manganese chloride so it is getting reduced.