Chemical Engineering Thermodynamics
Critical temperature is defined as the temperature above which a gas will

Not liquify (barring exceptions)
Immediately liquify
Never liquify however high the pressure may be
None of these

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Chemical Engineering Thermodynamics
If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as

Solubility increases as temperature decreases
Solubility is independent of temperature
Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution
Solubility increases as temperature increases

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