Evaporation only takes place at boiling point of a liquid.

True

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False

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Solution

The correct option is B False
Evaporation is a process which takes place at all temperatures of a liquid. The molecules on the surface of a liquid attain enough kinetic energy to overcome the attraction forces of the molecules present in the bulk. It is a surface phenomenon and it doesn't depend on the temperature of a liquid.

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Similar questions

Below the boiling point of a liquid evaporation takes place. Then when the liquid is being heated to vaporise it, before reaching its boiling point does the liquid not evaporate?

Write true or false for each statement :

(a) The temperature of a substance remains unaffected during its change of state.

(b) Ice melts at $100^{\circ} C .$

(d) Evaporation of a liquid causes cooling.

(e) Water evaporates only at $100^{\circ} C .$

(f) Boiling takes place over the entire mass of the liquid.

(g) Evaporation takes place over the entire mass of the liqid.

(h) The process of a gas converting directly into solid is called vaporization.

(i) At high altitudes, water boils above $100^{\circ} C .$

(j) The melting point of ice is $0^{\circ} C$

State True or False :

Vaporisation takes place only at boiling point.

Q. The phenomenon of changing liquid into vapours at a temperature its boiling point is called evaporation.

Fill in the blanks :

(a) Boiling occurs at ___

(b) Evaporation takes place at ___

(d) Heat is ___ during boiling.

(e) Cooling is produced in ___

(f) A longer rod expands ___ than a shorter rod on being heated to the same temperature.

(g) Liquids expand ___ than the solids.

(h) Gases expand ___ than the liquids.

(i) Alcohol expands ___ than water.

(j) Iron expands ___ than copper.

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