A:3 Cl2 + 6 FeI2 =2FeCl3 + 4 FeI3
B:3Cl2 + 2FeI2 = 2FeCl3 + 2I2
C:Co2O3 + 6 HCl =2CoCl2 + Cl2↑+ 3H2O
D:2FeCl3+ 2HI = 2FeCl2+ I2 + 2HCl
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