Chemical Engineering Thermodynamics
The main feature of Carnot refrigeration cycle is that, it

Transfers heat from high temperature to low temperature
Does not need the addition of external work for its functioning
Accomplishes the reverse effect of the heat engine
None of these

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Chemical Engineering Thermodynamics
Free energy

Remains unchanged in reversible processes carried at constant temperature and pressure
All of these
Change during a spontaneous process has a negative value
Decreases in all spontaneous (or irreversible) processes

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

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