Chemical Engineering Thermodynamics
The fusion of a crystalline solid at its melting point to form a liquid at the same temperature is accompanied by

No change in enthalpy
Decrease in enthalpy corresponding to evolution of heat
Decrease of entropy
Increase in enthalpy corresponding to absorption of heat

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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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