The equation represents the reaction of a halogen with aqueous bromide ions. $X_2 + 2\text{Br}^- \rightarrow 2\text{X}^- + \text{Br}_2$ Which words fill gaps 1, 2 and 3?
- A1 chlorine; 2 brown; 3 colourless
- B1 chlorine; 2 colourless; 3 brown
- C1 iodine; 2 brown; 3 colourless
- D1 iodine; 2 colourless; 3 brown