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 |
 81%
From NCERT
NEET - 2018
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