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Q.

Which gas forms the liquid first when air is cooled during fractional distillation?

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a

Argon 

b

Oxygen

c

Nitrogen

d

Carbon dioxide

answer is B.

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Detailed Solution

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  • The gases of air are separated by fractional distillation.
  • Air is a homogeneous mixture of gases and the air is first liquified by increasing the pressure and decreasing the temperature. The components of liquid air are then separated using fractional distillation. 
  • The gas with the highest boiling point will liquify first. Thus, as the boiling point of oxygen is the highest among these gases, it forms the liquid first on cooling the air.


 

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