2 KMnO4 (aq) + 10 NaCl (aq) + 13 H2SO4 (aq) → 10 NaHSO4 (aq) + 2 MnSO4 (aq) + K2SO4 (aq) + 5 Cl2 (g) + 8 H2O (l)
This is an oxidation-reduction (redox) reaction:
2 MnVII + 10 e- → 2 MnII (reduction)
10 Cl-I - 10 e- → 10 Cl0 (oxidation)
KMnO4 is an oxidizing agent, NaCl is a reducing agent.
This is a gas evolution reaction, Cl2 is the formed gas.