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Question
The rate of evaporation of a liquid increases when:
Options
temperature of liquid falls
liquid is poured in a vessel of less surface area
air is blown above the surface of liquid
humidity increases
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Solution
air is blown above the surface of liquid
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RELATED QUESTIONS
Temperature of a liquid rises during boiling or vaporization
Boiling occurs at ....................
Evaporation takes place at ................. .
The molecules of liquid ............. heat from surroundings in evaporation.
Match the column
| Column A | Column B |
| (a) Blowing air increases | (1) Increase in intermolecular separation |
| (b) Increase in pressure increases | (2) Pendulum of a clock |
| (c) Thermal expansion |
(3) Cooking utensils |
| (d) Invar | (4) Boiling point |
| (e) Pyrex glass | (5) Evaporation |
In evaporation
No heat is supplied to a liquid during evaporation. How does then the liquid change into its vapours?
Comment on the statement ‘evaporation is a surface phenomenon’.
Give reason for the increase in rate of evaporation of a liquid when air is blown above the liquid.
Name two ways of change of liquid state to the vapour state and distinguish them.
