Here's the breakdown:
* Halogens are a group of highly reactive nonmetals in the periodic table (Fluorine, Chlorine, Bromine, Iodine, Astatine).
* Reactivity of halogens decreases as you go down the group. This means fluorine is the most reactive, followed by chlorine, then bromine, and so on.
* In a reaction, the more reactive halogen will displace the less reactive one from its salt.
In this case:
* Chlorine is more reactive than bromine.
* Potassium chloride (KCl) contains chlorine.
* Bromine cannot displace chlorine from its salt.
Therefore, bromine does not react with aqueous potassium chloride.
However, if you were to add a solution of bromine to a solution of potassium iodide (KI), a reaction would occur. Bromine would displace iodine because it is more reactive.
