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).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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