Which of the given gases is the most difficult to liquefy

The same question, asked 2 times: 15 May 2023 S2*, 12 May 2026 S2. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
15 May 2023 S2
78 $Which among the following gases is difficult to liquify?$
Tap an option to check your answer.
Question 2
12 May 2026 S2
5 $Which among the following gases is difficult to liquefy ?$
Tap an option to check your answer.