What kind of molecules in a liquid can evaporate?


The molecules having high kinetic energies can evaporate.
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Name the factors on which vapour pressure of any liquid depends.


Factor at which vapours pressure of a liquid depends on:(i) Temperature (ii) Nature of liquid.
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Give two examples of physical equilibrium.

(i) Evaporation of water in a closed vessel.

(ii) Dissolution of a gas in a liquid under pressure in a closed vessel.

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Under what condition solid rightwards harpoon over leftwards harpoon liquid, equilibrium can exist?


At the melting point or freezing point.
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What is equilibrium?


It may be defined as a state in all changes or reactions carried in a closed vessel, where the measurable properties of the system such as colour, density, vapour pressure, concentration, temperature etc. do not show any further noticeable change.
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