The document defines various states of matter and chemistry concepts. It provides definitions for solid, liquid, gas, diffusion, pressure, temperature, heat, density, vapor pressure, boiling, melting, sublimation, latent heat of fusion, and Brownian motion. It then presents multiple choice questions related to these topics, with an answer key provided. Some key points covered are that solids have a definite shape and volume, liquids have a definite volume but not shape, and gases have neither definite shape nor volume. It also defines boiling as when vapor pressure equals atmospheric pressure and sublimation as when a solid changes directly to a gas without passing through the liquid state.

1. Chapter 6
States of matter
(Every action has reaction, yes exactly if you
can not please your books how you will be
pleased)
Chemistry Def. & MCQs Dr. Sajid Ali Talpur

2.  Definitions
1. Matter: - Any thing having mass and volume is
called matter.
2. Solid: - The state of matter having specific
shape and volume
3. Liquid: - The state of matter having specific
volume but not the shape.
4. Gas: - It is the state of matter having neither
specific volume nor the shape
5. Diffusion: - the distribution or spreading of the
gas molecules throughout the vessel is known as
diffusion. OR the mixing and merging of the
molecules with each other is called diffusion
6. Pressure: -force per unit area.
7. Temperature: - the degree of hotness or
coldness of a body is called temperature.
8. Heat: - it is the form of energy that produces
sense of warmth and flows from hot body to
cold body.
9. Density: - the mass unit volume is called
density. (d=M/V)
Chemistry Def. & MCQs Dr. Sajid Ali Talpur

3. 10. Vapour pressure: - it is the pressure exerted by
the vapors on the surface of liquid when rate of
condensation exceeds the rate of evaporation.
11. Boiling: - when vapour pressure of liquid equals
the atmospheric pressure, the bubbles of vapour
form easily and rise to the surface. The liquid is
said to boil.
12. Boiling point: -it is the temperature at which
boiling starts.
13. Melting: - conversion of a solid into liquid.
14. Melting point: - it is the temperature at which
melting begins to take place.
15. Sublimation: -the process of conversion of
solids directly into gases form without passing
through the liquid state is called sublimation.
16. Phenomenon: -an observable event.
17. The latent heat of fusion: - heat required
during conversion of the state. OR the heat
energy required converting 1g of a solid into
liquid at its melting point.
18. Brownian motion: - A continuous, zigzag
motion of suspended particles through the
medium is called Brownian motion.
Chemistry Def. & MCQs Dr. Sajid Ali Talpur

4.  Multiple Choice Question
1. Any thing having mass and volume is not called
called
a) power b) energy
c) both a & b d) matter
2. The quantity of matter in a body is called
a) mass b) energy
c) matter d) volume
3. According to K.M.T all are true except:
a) molecules are always in motion:
b) they possess K.E
c) they possess P.E
d) molecules are very tiny particles
e) N.O.T
4. The space occupied by an object is called
a) mass b) energy
c) volume d) matter
5. Regarding gases all are true except:
a) K.E very low
b) intermolecular space very high
c) neither shape nor volume
d) molecules move in all directions.
6. The liquids have constant shape but not volume.
a) true b) false
7. The spreading of a substance through a medium
is called:
Chemistry Def. & MCQs Dr. Sajid Ali Talpur

5. a) diffusion b) Brownian motion
c) effusion d) fusion
8. A continuous, rapid, zigzag motion of
suspended particles through the medium is
called Brownian motion.
a) true b) false
9. Water can exist in all the three states of matter.
a) true b) false
The Book MCQs
10. The number of common states of matter is:
a) 3 b) 4
c) 5 d) N.O.T
11. Neither definite shape nor volume is the
property of:
a) solids b) liquids
c) gases d) N.O.T
12. The temperature at which the vapour pressure of
a liquid becomes equal to its external pressure is
called:
a) melting point b) boiling point
c) triple point d) freezing point
13. The state of matter in which molecules are
tightly packed and possess only vibratory
motion is:
a) solid state b) liquid state
c) gaseous state d) N.O.T
Chemistry Def. & MCQs Dr. Sajid Ali Talpur

6. 14. The process in which molecules escape from the
surface of liquid is called:
a) sublimation b) evaporation
c) boiling d) melting
15. the process in which solid directly changes to
gas is called
a) sublimation b) evaporation
c) boiling d) melting
Answer Key
1 C 2 A 3 C
4 C 5 A 6 B
7 A 8 B 9 A
10 A 11 C 12 B
13 A 14 B 15 A
Chemistry Def. & MCQs Dr. Sajid Ali Talpur

7. 14. The process in which molecules escape from the
surface of liquid is called:
a) sublimation b) evaporation
c) boiling d) melting
15. the process in which solid directly changes to
gas is called
a) sublimation b) evaporation
c) boiling d) melting
Answer Key
1 C 2 A 3 C
4 C 5 A 6 B
7 A 8 B 9 A
10 A 11 C 12 B
13 A 14 B 15 A
Chemistry Def. & MCQs Dr. Sajid Ali Talpur