Question

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions.

• A. Low temperature, Low pressure
• B. High temperature, Low pressure
• C. Low temperature, High pressure
• D. High temperature, High pressure

Answer 1

Answer: (C)

Low temperature, High pressure

Intermolecular force of attraction order:

Solids > Liquids > Gases

Gases can be liquefied when the inter-molecular attraction between particles increases. At low temperatures, the particles have less kinetic energy to overcome the forces of intermolecular attraction and hence exist in liquid state. At high pressure, the formation of intermolecular attraction is more favourable. Therefore, at high pressure and low temperature gases can be liquified.