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12 HCl (aq) + 4 KMnO4 (aq) + 5 As2O3 (s) → 6 H2O (l) + 4 KCl (aq) + 4 MnCl2 (aq) + 5 As2O5 (aq)

12 HCl (aq) + 4 KMnO4 (aq) + 5 As2O3 (s) 6 H2O (l) + 4 KCl (aq) + 4 MnCl2 (aq) + 5 As2O5 (aq)

This is an oxidation-reduction (redox) reaction:

4 MnVII + 20 e 4 MnII (reduction)

10 AsIII 20 e 10 AsV (oxidation)

KMnO4 is an oxidizing agent, As2O3 is a reducing agent.