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In the reaction MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2, which substance is oxidised?

Question
In the reaction MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2, which substance is oxidised?
MnO2
HCl
H2O
MnCl2
Answer
HCl
Detailed Explanation
Hydrochloric acid (HCl) is oxidised to chlorine gas (Cl2) in this reaction.
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