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Question

Pressurising a gas and reducing its temperature helps in the of gases.

A
liquefaction
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B
expansion
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C
evaporation
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Solution

The correct option is A liquefaction
Applying pressure means forcing the particles of matter towards each other (reducing the free space between the particles). Thus, the application of pressure reduces the inter-particle distance. As a result, the application of large pressure changes the gas into liquid first and then into a solid. Reducing the temperature reduces the kinetic energy of the matter; thus, particles of the matter will not move in random motion and will convert into liquid. As we apply pressure, inter-particle distance decreases which leads to a change of state. Here applying pressure and reducing temperature leads to liquefaction of gases.

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