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2 HCl (aq) + 2 KMnO4 (aq) + 3 K2SO3 (aq) → H2O (l) + 3 K2SO4 (aq) + 2 KCl (aq) + 2 MnO2 (s)

2 HCl (aq) + 2 KMnO4 (aq) + 3 K2SO3 (aq) H2O (l) + 3 K2SO4 (aq) + 2 KCl (aq) + 2 MnO2 (s)

This is an oxidation-reduction (redox) reaction:

2 MnVII + 6 e 2 MnIV (reduction)

3 SIV 6 e 3 SVI (oxidation)

KMnO4 is an oxidizing agent, K2SO3 is a reducing agent.

This is a precipitation reaction: MnO2 is the formed precipitate.