To measure the vapor pressure of a liquid in the manometric method, the liquid is
Correct answer: C. Frozen
- A. Warmed
- B. Boiled
- C. Frozen
- D. Cooled
Explanation
The liquid is frozen with the help of a freezing mixture and the space above the liquid is evacuated. In this way, the air is removed from the surface of the liquid alongwith the vapours of that liquid. The frozen liquid is then melted to release any entrapped air. Liquid is again frozen and realeased air is evacuated. This process is repeated many times till almost all the air is removed. (PTB Chemistry 11, Chapter 4: Liquids and Solids, Measurement of Vapour Pressure)
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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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