The molecules of liquid ............. heat from surroundings in evaporation.

Fill in the Blanks

The molecules of liquid absorb heat from surroundings in evaporation.

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Change of Liquid into Vapour State

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Chapter 6: Heat Transfer - Objective questions [Page 119]

Chapter 6 Heat Transfer
Objective questions | Q 2.03 | Page 119

Temperature of a liquid rises during boiling or vaporization

Boiling occurs 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 boiling point of a liquid is increased by

Do all the molecules of a liquid take part in evaporation? If not, explain your answer.

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’.

Why is cooling produced when a liquid evaporates?

Give reason for the increase in rate of evaporation of a liquid when surface area of liquid is increased.

How is the heat energy supplied to a liquid used during boiling at a fixed temperature?