When common salt is dissolved in water ?
Correct answer: B. Boiling point of water increase
- A. Boiling point of water decrease
- B. Boiling point of water increase
- C. Boiling point of water remains same
- D. None of the above
Explanation
Dissolved salt lowers the vapour pressure of water, so a higher temperature is needed for the solution's vapour pressure to equal atmospheric pressure. Therefore, the boiling point increases; the common mistake is choosing a because students confuse vapour-pressure lowering with boiling-point lowering.
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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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