Q.
Given van der Waals constant for $NH_3$, $H_2$, $O_2$ and $CO_2$ are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied ?
A) $O_2$
B) $H_2$
C) $NH_3$
D) $CO_2$
Explanation
[Solution] The larger 'a' (intermolecular attraction), the easier the liquefaction; $NH_3$ has the largest a. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.