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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