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In a solution undergoing freezing point depression, which phases are in equilibrium?

1. liquid solvent and solid solvent
2. liquid solvent and solid solute
3. liquid solute and solid solvent
4. liquid solute and solid solute

Correct answer: liquid solvent and solid solvent

Solution

During freezing-point depression the equilibrium is between liquid solvent and solid solvent (pure solvent freezes out); the solute stays dissolved. So the stored 'liquid solute and solid solvent' is wrong.

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