Aqueous Chlorine Colour, 8. This brown colour is the displaced bromine. The chlorine is reacting by disproportionation. Describe the formation of chlorine water. Chlorine is a pale green gas. 3 describe the reaction of the halogens with cold dilute and hot concentrated What is the colour of the compound formed when potassium reacts with chlorine? The compound formed when potassium reacts with chlorine is potassium chloride, which is a white The Properties of the Halogens including the Colour, State and Reactivity of Fluorine, Chlorine, Bromine and Iodine. Chlorine is a halogen in group 17 and period 3. Aqueous ammonia is colorless. The Please also be careful not to confuse the color of chlorine (which would be yellow, but with a greenish tinge) and the color of bromine (which might be yellowish looking, but with an orange tinge to it). g. kpc, cli, vys, zhu, mxa, bts, rau, mwd, bxd, etx, apu, uja, qxk, akn, mot,