Q.
The gases are easily liquefied when
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a
they are compressed at higher temperature
b
they are compressed at lower temperature
c
they are expanded at higher temperature
d
they are expanded at lower temperature
answer is B.
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Detailed Solution
Gases do not liquefy on compression only, although molecules come very close to each other and intermolecular forces operate to the maximum. However, when the thermal energy of molecules is reduced by lowering of temperature, the gases can be very easily liquefied.
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