why is browmium vapour heavier than air ?
It is a property of bromine vapour.Air is a mixture of gases nitrogen and oxygen primarily which are lighter than bromine vapour.
Air is heavier than HCl gas.
When a gas jar full the lower jar go upward into the jar containing air. In this experiment :
(a) air is heavier than bromine
(b) both air and bromine have the same density
(c) bromine is heavier than air
(d) bromine cannot be heavier than air because it is going upwards against gravity