1. NaCl + H2SO4 -to-> NaHSO4(B) + HCl (A)
2. MnO2 + 4HCl -to-> MnCl2 (D) + Cl2 (C) + H2O (E)
3. 2NaBr + Cl2 -to-> 2NaCl (G) + Br2 (F)
4. NaI + Br2 (F) => NaBr (I) + I2 (H)
5. AgNO3 + NaCl => AgCl J) + NaNO3 (K)
6. NaOH + HCl (A) => NaCl(G) + H2O (E)
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