A gas jar of bromine vapour and a gas jar of air are set up as shown in diagram 1.
The glass slide is removed. Diagram 2 shows the appearance of the gas jars after one hour.
air
glass slide
mixture of air
and bromine
bromine
vapour
diagram 2
diagram 1
Which statement explains why the bromine and air mix together?
A Bromine is denser than air.
B Bromine is lighter than air.
с
Bromine molecules moved upwards and molecules in air moved downwards.
D Molecules in bromine and air moved randomly.
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Explanation:
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 upper gas jar containing air.
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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