A:2Fe2++Cl2 = 2Fe3++2Cl-
B:2Br-+Cl2 = Br2+2Cl-
C:4Fe2++2Br-+3Cl2 = Br2+4Fe3++6Cl-
D:2Fe2++4Br-+3Cl2 = 2Br2+2Fe3++6Cl-
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