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12 HCl (aq) + 4 KMnO4 (aq) → 6 H2O (l) + 5 O2 (g) + 4 KCl (aq) + 4 MnCl2 (aq)

12 HCl (aq) + 4 KMnO4 (aq) 6 H2O (l) + 5 O2 (g) + 4 KCl (aq) + 4 MnCl2 (aq)

This is an oxidation-reduction (redox) reaction:

4 MnVII + 20 e 4 MnII (reduction)

10 O-II 20 e 10 O0 (oxidation)

KMnO4 is an oxidizing agent, KMnO4 is a reducing agent.

This is a gas evolution reaction, O2 is the formed gas.