Question

Which among the following gases is difficult to liquefy?

• A. Ammonia
• B. Carbon dioxide
• C. Oxygen
• D. Chlorine

Hint:

Gases with weaker intermolecular forces are more difficult to liquefy than those with stronger interactions, such as ammonia or carbon dioxide.

Answer 1

The Correct Option is C

Step 1: Understanding the process of liquefaction.
Liquefaction of gases depends on their ability to form intermolecular forces, such as Van der Waals forces. Oxygen has relatively weak intermolecular forces compared to gases like ammonia and carbon dioxide, which are easier to liquefy due to stronger intermolecular interactions.
Step 2: Analyzing the options.
(A) Ammonia: Incorrect. Ammonia has strong hydrogen bonding, which makes it easier to liquefy.
(B) Carbon dioxide: Incorrect. Carbon dioxide has relatively strong intermolecular forces and is easily liquefied.
(C) Oxygen: Correct — Oxygen has weak intermolecular forces, making it harder to liquefy under normal conditions.
(D) Chlorine: Incorrect. Chlorine can be liquefied at low temperatures due to its relatively stronger intermolecular forces.
Step 3: Conclusion.
The correct answer is (C) Oxygen, as it is the gas most difficult to liquefy among the options.