Stoichiometry
In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is

Independent of temperature
Unchanged with pressure changes
Increased with decrease in pressure
Increases with rise in pressure

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Stoichiometry
An ideal gas can be liquified, because

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

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