Question

Which of the following represent the suitable conditions for the liquefaction of gases ?
(a) low temperature, low pressure
(b) high temperature, low pressure
(c) low temperature, high pressure
(d) high temperature, high pressure

Answer 1

c)Low temperature, High pressure

Explanation:

• We are supposed to find the suitable conditions for liquefaction of gases.

• We know that gases do not have a fixed shape and have less force of attraction due to which the volume occupied by gases is more.

• We know that Boyle's law states that Pressure times the volume is always constant for a gas at constant temperature.
• So in order to convert the gas into a liquid the volume needs to be reduced which can be obtained by application of high pressure.
• Gases usually have a higher temperature than liquids. By providing negative heat or removing energy from the system we can reduce the temperature of a gas .
• So lower temparatures and high pressures are preferred for obtaining a gas particle from liquid.

Answer 2

Answer is Option (c)

Explanation:

• The Transformation of gaseous to Liquid state is called Liquefaction. It is basically due to certain physical changes in the temperature, pressure & Volume.

• Changes in State from Gas to Liquid in $CO_2$ (Carbon dioxide) was studied firstly by Thomas Andrew.

• It was seen in most gases (Real), they behave the same way as Carbon dioxide but with certain changes (Physical) in Pressures & temperatures.

Here, we can judge that the answer is option (c) i.e. Low temperature and high pressure.