Chemical Engineering Thermodynamics
Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the

Low pressure and low temperature
Low pressure and high temperature
High pressure and low temperature
High pressure and high temperature

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

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