Answer:
In the vapour state, the molecules
of bromine have more kinetic energy than in the liquid state. Therefore,
collisions with the molecules of other reactants in the vapours state will be
faster than in the liquid state. Moreover, in the vapour state, the surface
area available for the chemical reaction is more as compared to the liquid
state. Hence, bromine in the vapour state reacts at a faster rate compared with
the liquid state.
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