arrange the gases present in the air in th increasing order of their boiling points.Which gas forms liquid first as the air is cooled?

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Solution

The major components of the air are:
Nitrogen - 78%
Oxygen - 20%
Argon - 0.93%
Carbon dioxide - 0.031%
Other gases such as Neon, Helium, Hydrogen etc, are present in trace amounts.
The increasing order of the boiming points of the above gases is :
Nitrogen (lowest)
Argon
Oxygen
Carbon dioxide.
Therefore, Carbon dioxide forms the liquid first as the air is cooled and nitrogen forms the liquid in the last.

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