Considering the solution process:
- the process of forming a solution is always accompanied by a decrease in entropy of the system.
- intermolecular forces are important when the solvent or solute is a liquid or a solid.
- the mixing of gases is a nonspontaneous process.
- the process of mixing is always exothermic.
Answer: Intermolecular forces are important when the solvent or solute is a liquid or a solid.