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प्रश्न
Do all the molecules of a liquid take part in evaporation? If not, explain your answer.
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उत्तर
No, all the molecules of the liquid do not take part in evaporation only those molecules near the surface of the liquid which acquire sufficient Kinetic energy (Threshold velocity) escape as they overcome attractive forces of other molecules. Then other molecules come to the surface of the liquid and acquire more K.E. and escape the surface. This continues till all the liquid evaporates.
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संबंधित प्रश्न
Evaporation is rapid on a wet day.
All molecules of a liquid take part in boiling.
Boiling is a rapid phenomenon.
Evaporation takes place at ................. .
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 |
The rate of evaporation of a liquid increases when:
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.
Give reason for the increase in the rate of evaporation of a liquid when temperature of liquid is increased.
What is boiling? Explain it on the basis of molecular motion?
