Beckmanns apparatus is used to measure_______________?
Correct answer: B. depression in freezing point
- A. boiling point elevation
- B. depression in freezing point
- C. lowering of vapour pressure
- D. lowering of osmotic pressure
Explanation
A Beckmann apparatus, particularly its sensitive Beckmann thermometer arrangement, is commonly used to measure the depression in freezing point caused by a dissolved solute. Students may choose boiling-point elevation because the same type of apparatus can be adapted for colligative measurements, but the standard association in this question is freezing-point depression.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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