Stoichiometry
The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation

Both B & C
Increases with pressure rise
Becomes zero at the critical point
Decreases with increasing pressure

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Stoichiometry
An ideal gas can be liquified, because

Its critical temperature is more than 0°C
Forces operative between its molecules are negligible
Its molecular size is very small
It gets solidified directly without becoming liquid

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