Question

Gases can be liquified by:

• A. increasing temperature
• B. decreasing pressure
• C. increasing pressure
• D. decreasing temperature

Answer 1

Answer: (C), (D)

The correct options are
C increasing pressure
D decreasing temperature

Pressure and temperature affect the state of a substance.
On applying the pressure and decreasing temperature, particles move closer and their motion gets restricted. Thus, the interparticle force of attraction increases and interparticle space decreases. Hence, gases can be converted to liquids by increasing pressure and decreasing temperature.