Question

It is easier to liquefy ammonia than oxygen because

• A. It is easier to compress oxygen than $NH_{3}$
• B. $NH_{3}$has a very low critical temperature as compared to $O_{2}$
• C. $O_{2}$has a higher value of van der Waals constant a and higher critical temperature than $NH_{3}$
• D. $NH_{3}$has a higher value of van der Waals constant a and higher critical temperature than oxygen.

Answer 1

Answer: (D)

$NH_{3}$has a higher value of van der Waals constant a and higher critical temperature than oxygen.

Answer 2

: $NH_{3}$has higher value of a, it means intermolecular forces are stronger and higher critical temperature than oxygen, hence easy to liquefy.