Chemical Engineering Thermodynamics
PVy = constant, holds good for an isentropic process, which is

Isothermal and irreversible
Reversible and adiabatic
Adiabatic and irreversible
Reversible and isothermal

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

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