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  • Which of the following statement is / are true for the equilibrium between water and water vapour ? Option: 1 It has constant vapour pressure&nb

Which of the following statement is / are true for the equilibrium between water and water vapour ? 

Option: 1

It has constant vapour pressure 


Option: 2

Rate of conversion of vapours to water and water to vapours becomes constant 


Option: 3

Rate of conversion of vapours to water and water to vapours becomes same 


Option: 4

Both a and c 


Answers (1)

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As we have learned

Liquid Vapour equilibrium -

When a liquid evaporates in a closed container molecules with relatively higher kinetic energy escape the liquid surface into the vapour phase and number of liquid molecules from the vapour phase strikes the liquid surface and are retained in the liquid phase.It gives rise to a constant vapour pressure because of an equilibria.

e.g.\:H_{2}O(liquid)\rightleftharpoons H_{2}O(vapour)

-

 

 For an equilibrium between water and water vapours the vapour pressure becomes constant and the rate of conversion of the two species becomes same 

 

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