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

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

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Stoichiometry
An ideal gas can be liquified, because

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

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