Question

A gar jar cointaining air is placed upside down on a gas jar of bromine vapours . It is observed that after some time , the gas jar cointaining air also becomes completely reddish brown. Explain why this happen. Name the process involved .

Answer 1

A gas jar containing air is placed upside down on a gas jar containing bromine vapours . It is observed after sometime , the gas jar containing air also becomes completely reddish brown.

Reason:
1. We observe that, after some time, the red brown vapours of bromine  spread out into the upper gas jar containing air.
In this way the upper gas jar which contains air in it also turns red-brown.
2. This mixing is due to Diffusion of Bromine vapour into air.. Air from upper jar also diffuses into lower jar though we cannot see it.
So, Diffusion is the process in which mixing of substances with another substance takes place  due to motion of particles. 
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Answer 2

Diffusion is the process involved. .....