Four gas cylinders containing He, N2, CO2, and NH3 gases, separately, are gradually cooled from a temperature of 500 K. Which gas will liquify first?

(Given TC in K – He : 5.3, N2 : 126, CO2 : 304.1 and NH3 : 405.5)

1. He
2. N2
3. CO2
4. NH3
Subtopic:  Liquefaction of Gases & Liquid |
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If van der Waals constant "a" for NH3, H2 and CO2 are respectively 4.17, 0.244, 1.36 and 3.59, then which one of the following gases is most easily liquefied?

1. NH3
2. H2
3. O2
4. CO2

Subtopic:  Liquefaction of Gases & Liquid |
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The surface tension of which of the following liquid is maximum:

1. C6H6

2. H2O

3. C2H5OH

4. CH3OH

Subtopic:  Liquefaction of Gases & Liquid |
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