Question

A gas can be liquified by:

• A. lowering the temperature
• B. increasing the temperature
• C. increasing the pressure.
• D. both by increasing the pressure and lowering the temperature.

Answer 1

The correct option is D

both by increasing the pressure and lowering the temperature.

Explanation for correct answer:

d) both by increasing the pressure and lowering the temperature:

• The process of converting things from their gaseous form to liquid form is known as liquefaction of gases.
• When a gas is compressed, having maximum intermolecular space, the space between the particles decreases which can be done easily by increasing the amount of pressure applied and by decreasing the temperature.

a) Lowering the temperature: It lowers the kinetic energy of the particles and thus bringing the particles closer and the gas liquifies.

c) Increasing the pressure: It decreases the intermolecular spaces between the particles and then the gas liquifies.

b) Increasing the temperature : It further increases the kinetic energy of the particles making their motion more random and then it is difficult to liquify the gas.

Hence, option d) is correct. A gas can be liquified by both increasing the pressure and lowering the temperature.