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?

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.