A gas jar containing air is upside down on a gas jar of bromine vapour. It is observed that after some time, the gas jar containing air also become completely reddish brown.
(a) Explain why this happens.
(b) Name the process involved.
(a) Both air and bromine vapours are in a gaseous state and has a random motion. The particles of a gas have maximum kinetic energy. They move with high speed in all directions and can exert pressure on the walls of its container. The moving particles of bromine vapour and air collide with each other and bounce about in all directions due to which they get mixed uniformly.
(b) This process is called diffusion.
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