KMnO4 + HCl = KCl + MnCl2 + H2O + Cl2 => 
2 KMnO4 + 16 HCl = 2 KCl + 2 MnCl2 + 8 H2O + 5 Cl2

S{-2} + I2 = I{-} + S => 
S{-2} + I2 = 2 I{-} + S