What happens to freezing point of benzene when small quantity of naphthalene is added to benzene?
Solutions · Class 12 · JEE Main Previous Year Question
What happens to freezing point of benzene when small quantity of naphthalene is added to benzene?
- a
Increases
- b
Remains unchanged
- c
First decreases and then increases
- d✓
Decreases
Decreases
Strategy:\n> According to Raoult's Law, the vapor pressure of a solution () is the vapor pressure of the pure solvent () multiplied by its mole fraction ().\n\nAnalysis:\n1. A non-volatile solute takes up space at the surface but doesn't contribute to vapor.\n2. Thus, the escape frequency of solvent molecules is reduced.\n3. . Since , the vapor pressure is always lowered.\n\n
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