Chemistry 9 Chapter 5 - Physical States of Matter -5

Chemistry 9 Chapter 5 - Physical States of Matter -5

1. When a liquid is placed in an open container, its volume will?

a) Decreases gradually
b) Not change
c) Increases gradually

2. Conversion of a liquid to a gas or vapour at all temperatures is known as?

a) Evaporation

b) Condensation
c) Sublimation

d) Diffusion

3. Molecules of liquid with highest kinetic energy will escape?

a) Last
b) First

c) Not at all

4. When a liquid is heated, the kinetic energy of its molecules?

a) Increases

b) Decreases
c) Remains constant

5. Liquids evaporate ___ when heated?

a) Not at all
b) Faster

c) Slower

6. The pressure exerted by the vapours of a liquid in equilibrium
with its liquid is called as?

a) Evaporation
b) Condensation

c) Vapour pressure

d) Sublimation

7. With increase in temperature, the vapour pressure of a liquid?

a) Will not change
b) Decreases
c) Increases

8. The temperature at which vapour pressure of a liquid becomes equal
to the external or atmospheric pressure is known as?

a) Melting point
b) Evaporation
c) Vapour pressure
d) Boiling point

9. The liquid boils when its vapour pressure becomes?

a) Less than atmospheric pressure

b) None of these
c) Greater than atmospheric pressure

d) Equal to the atmospheric pressure

10. The normal boiling point of water is____degree centigrade?

a) 100
b) 0
c) 200
d) 50

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