In the reaction MnO2 + 4HCl → MnCl2 + 2H2O + Cl2, which substance is oxidized?
HCl
A substance is oxidised when it loses hydrogen (or electrons) or its element's oxidation number rises.
In HCl, chlorine is at −1; it becomes Cl2 at 0, so HCl is oxidised.
MnO2 loses oxygen (Mn goes from +4 to +2), so it is reduced and acts as the oxidising agent.
Hence, the answer is HCl.
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