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Chemistry Class 9 Chapter 5


Updated: 01 Oct 2023

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Chemistry Class 9 Chapter 5 is about the “Physical States of Matter”. This article includes topics such as Gaseous State, Typical Properties of Gases (Indefinite Volume, Indefinite Shape, Diffusion, Effusion, Pressure, Compressibility, Density), Laws related to Gases, Boyle’s Law, Charles’s Law, Liquid State, Typical Properties of Liquids (Volume and Shape Evaporation, Vapour Pressure), Factors Affecting Vapour Pressure (Nature of Liquid, Intermolecular Forces, Size of Molecules, Temperature, Boiling Point, Freezing Point, Diffusion, Mobility, Density), Solid State, Typical Properties of Solids (Volume and Shape, Melting Point, Rigidity and Density), Types of Solids (Amorphous Solids, Crystalline Solids), Allotropy, Allotropes of Carbon (Structure of Diamond, Graphite, Buckyball)

Chemistry Class 9 Chapter 5 Notes

Physical States of Matter

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Chemistry Class 9 Chapter 5 Notes

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Chemistry Class 9 Chapter 5-MCQs

Introduction

1. Anything that has mass and occupy space is ________
(a) Matter
(b) Energy
(c) Photon
(d) Ion
Show Answer

Matter


2. How many states matter has ?
(a) 3
(b) 4
(c) 5
(d) 6
Show Answer

3


3. What are the types of matter ?
(a) Solid
(b) Liquid
(c) Gas
(d) All of them
Show Answer


4. All the three states of matter are _____ to one another :
(a) In equilibrium
(b) Inter-convertible
(c) Probable
(d) None of these
Show Answer

All of them


5. When the temperature of solid is increased it is converted into _______
(a) Solid
(b) Liquid
(c) gas
(d) None
Show Answer

Liquid


6. When the temperature of liquid is increased it is converted into _________
(a) Solid
(b) Liquid
(c) Gas
(d) None
Show Answer

Gas


7. Gas is the state of matter in which molecules are _______ from each other.
(a) Far away
(b) Near
(c) Away
(d) None
Show Answer

Far away


8. There is a weak ______ of attraction between gas molecules.
(a) Bond
(b) Intermolecular force
(c) Electrostatic force
(d) None of these
Show Answer

Intermolecular force


Gaseous State

9. The particles of gas are free to move in ______ with great speed.
(a) Left to right
(b) Top to bottom
(c) All direction
(d) None of these
Show Answer

All direction


10. Gases occupy ______ volume of its container.
(a) Whole
(b) Half
(c) One third
(d) None of these
Show Answer

Whole


To Download Complete Notes of Class 9 Chemistry Notes, Click the link.

Typical Properties of Gases

Indefinite Volume

11. Gases have ______ volume and they will occupy all available spaces.
(a) Definite
(b) Indefinite
(c) Both
(d) None
Show Answer

Indefinite


Indefinite Shape

12. _______ do not have definite shape.
(a) Gases
(b) Solids
(c) Liquids
(d) None of these
Show Answer

Gases


Diffusion

13. Diffusion describes the movement of molecules from region of ________ concentration.
(a) Lower to higher
(b) Higher to lower
(c) Lower to lower
(d) None of these
Show Answer

Higher to lower


14. Gases takes the shapes of the container in which it is _______
(a) Placed
(b) Not placed
(c) Both a and b
(d) None of these
Show Answer

Placed


15. Once molecules become evenly distributed throughout the medium, there will be _____ in any direction.
(a) Less diffusion
(b) More diffusion
(c) No diffusion
(d) None of these
Show Answer

No diffusion


16. Gas molecules are in _____ random motion.
(a) Variable
(b) Constant
(c) No motion
(d) None of these
Show Answer

Constant


17. The gas molecules diffuses very quickly and form a ______ mixture .
(a) Homogeneous
(b) Heterogeneous
(c) Rectilinear
(d) None of these
Show Answer

Homogeneous


18. The spontaneous mixing of molecules of different gases to form a homogeneous mixture by random motion and collision of molecules is called ________
(a) Mobility
(b) Diffusion
(c) Effusion
(d) None of these
Show Answer

Diffusion


19. In 1833_____discovered that a lighter gas can diffuse much faster than a heavier .
(a) Paulo coalhod
(b) Volkanovski
(c) Thomas graham
(d) None of these
Show Answer

Thomas graham


Effusion

20. The escape of molecule in the gasses state one by one without collision through a hole of ______ dimension is called effusion
(a) Molecular
(b) Atomic
(c) Massive
(d) None of these
Show Answer

Molecular


21. You can smell onions even when the bag is tightly sealed, this is due to _______
(a) Diffusion
(b) Effusion
(c) Evaporation
(d) None of these
Show Answer

Effusion


Pressure

22. The force exerted by the gas on per unit area of a container is called _______
(a) Pressure
(b) Mobility
(c) Density
(d) None of these
Show Answer

Pressure


23. The molecules of gas are in _________ state of motion.
(a) Line
(b) Spectral
(c) Continuous
(d) None of these
Show Answer

Continuous


24. The formula of the pressure is :
(a) P = A/F
(b) P = F/A
(c) P = FA
(d) None of these
Show Answer

P = F/A


25. The SI unit of pressure is ______
(a) N.m^{-2 }
(b) N.cm^{-2}
(c) Hertz
(d) None \ of \ these
Show Answer

N.m^{-2}


26. The SI unit of pressure is also called_______
(a) Frequency
(b) Temperature
(c) Pascal
(d) None of these
Show Answer

Pascal


27. At sea level at 0^0 C , the atmospheric pressure is ______
(a) 360 mm Hg
(b) 760 mm Hg
(c) 760 mm Ag
(d) None of these
Show Answer

760 mm Hg


28. 760 mm of Hg is also called _______
(a) 760 Torr
(b) 760 mol
(c) 760 Na
(d) None of these
Show Answer

760 Torr


Compressibility

29. The change in volume per unit change in pressure is :
(a) Mobility
(b) Density
(c) Compressibility
(d) None of these
Show Answer

Compressibility


30. ______ are highly compressible.
(a) Solid
(b) Gases
(c) Liquid
(d) None of these
Show Answer

Gases


31. This compressibility of gases is due to ____ empty spaces among gas molecules.
(a) Large
(b) Intermediate
(c) Small
(d) None of these
Show Answer

Large


32. When pressure is applied on gases, distance between the molecules decreases, its volume also ________
(a) increases
(b) Decreases
(c) Maximizes
(d) None of these
Show Answer

Decreases


Density

33. The mass per unit volume is called _____
(a) Density
(b) Allotropy
(c) Effusion
(d) None of these
Show Answer

Density


34. Density can be mathematically written as :
(a) d = m/v
(b) d = mv
(c) P = F/A
(d) None of these
Show Answer

d = m/v


35. The density is _____ proportional to its volume.
(a) Directly
(b) Inversely
(c) Constant
(d) None
Show Answer

Inversely


36. The density of gas is very _____ as compared to the same amount of liquid or a solid .
(a) Low
(b) High
(c) Lit up
(d) All of them
Show Answer

Low


37. Gaseous oxygen has a density _____ at 0^0 C .
(a) 0.00142 g/cm^3
(b) 1.00142 g/cm^2
(c) 5.00142 g/cm^3
(d) None \ of \ these
Show Answer

0.00142 g/cm^3


38. Liquid oxygen has a density of 1.149 g/cm^3 at ______
(a) +100^0 C
(b) -103^0 C
(c) -252^0 C
(d) None of these
Show Answer

-103^0 C


Boyle’s Law

39. Boyle`s law was presented by Robert Boyle in _______
(a) 1862
(b) 1762
(c) 1662
(d) 1962
Show Answer

1662


40 Robert Boyle gave the relationship volume and pressure of a gas at constant _______
(a) Temperature
(b) Pressure
(c) Volume
(d) Watt
Show Answer

Temperature


41. The volume of a given mass of gas is _______ proportional to the pressure at constant temperature is called Boyle `s law.
(a) Directly
(b) Inversely
(c) Statistically
(d) Non
Show Answer

Inversely


42. Mathematically , Boyle`s law can be written as
(a) PV = K_b
(b) V/T = K_c
(c) V \propto 1/p
(d) None of these
Show Answer

V \propto 1/p


43. K_b is called ______ of Boyle`s law.
(a) Constant
(b) Variable
(c) Predictable
(d) None of these
Show Answer

Constant


44. A 530 dm^3 sample of hydrogen gas collected in a container at 800 mm of Hg pressure at room temperature . what volume will the gas occupy at 400 mm of Hg ?
(a) 960 dm^3
(b) 1060 dm^3
(c) 1160 dm^3
(d) None of these
Show Answer

1060 dm^3


Charles’s Law

45. In 1787, who gave the relationship between volume and temperature of gas at constant pressure ?
(a) Jacques Charles
(b) Robert Boyle
(c) Robert Whittaker
(d) None of these
Show Answer

Jacques Charles


46. The volume of a given mass of a gas is directly proportional to the absolute temperature at constant pressure is called ________
(a) Boyle`s law
(b) Charles`s law
(c) Law of mass action
(d) None of these
Show Answer

Charles`s law


47. Mathematically, Charles law can be written as :
(a) V \propto T
(b) V \propto P
(c) V \propto 1⁄T
(d) None of these
Show Answer

V \propto T


48. The constant of Charles`s law is ______
(a) K_b
(b) K_c
(c) K_T
(d) None of these
Show Answer

K_c


49. The ________ between volume and absolute temperature of given mass of a gas at constant pressure .
(a) Product
(b) Algorithm
(c) Ratio
(d) None of these
Show Answer

Ratio


50. If 3 dm^3 of air is heated from 300 K to 400 K at constant pressure , then what is the volume of the gas at higher temperature ?
(a) 4 dm^3
(b) 4.5 dm^3
(c) 11.5 dm^3
(d) None
Show Answer

4 dm^3


Liquid State

51. Liquid is a state of matter in which the intermolecular forces of attraction are ______ the gaseous state.
(a) Stronger
(b) Weaker
(c) Similar
(d) None of these
Show Answer

Stronger


52. Liquid molecules have ______ energy.
(a) Potential
(b) Kinetic
(c) Force
(d) None of these
Show Answer

Kinetic


53. Liquid molecules have ______ motion .
(a) Random
(b) Rectilinear
(c) Curvilinear
(d) None of these
Show Answer

Random


Typical Properties of Liquid State

Volume and Shape

54. Liquid has a definite ________
(a) Shape
(b) Volume
(c) Both a and b
(d) None
Show Answer

Volume


55. Liquid do not have a definite ______
(a) Shape
(b) Volume
(c) Both a and b
(d) None
Show Answer

Shape


Evaporation

56. The molecules of a liquid move with different ______
(a) Potential energy
(b) Random motion
(c) Kinetic energy
(d) None of these
Show Answer

Kinetic energy


57. The molecules whose kinetic energies are higher can move _______
(a) Slower
(b) Intermediate
(c) Faster
(d) None of these
Show Answer

Faster


58. The conversion of liquid state into gaseous state is called _______
(a) Vapour pressure
(b) Evaporation
(c) Condensation
(d) None of these
Show Answer

Evaporation
Explanation:
Evaporation


59. The phenomenon in which a liquid is converted into vapour without _______ heating is called evaporation.
(a) External
(b) Internal
(c) Temperature
(d) None of these
Show Answer

External


60 Evaporation takes place at all ______
(a) Condition
(b) Temperature
(c) Energies
(d) None of these
Show Answer

Temperature


61 Evaporation cause ______
(a) Heating
(b) Boiling
(c) Cooling
(d) None of these
Show Answer

Cooling


62. Greater the surface area _______ will be the evaporation .
(a) Higher
(b) Lower
(c) Constant
(d) None of these
Show Answer

Higher


63. Lower the surface area _______ will be the evaporation.
(a) Higher
(b) Lower
(c) Constant
(d) None of these
Show Answer

Lower


64. With the increase in _______ , the kinetic energy of the molecule increases, so rate of evaporation increases.
(a) Condensation
(b) Boiling point
(c) Temperature
(d) None of these
Show Answer

Temperature


65. ______ the intermolecular forces, slow will be the rate of evaporation.
(a) Stronger
(b) Average
(c) Weaker
(d) None of these
Show Answer

Stronger


66. _______ the intermolecular forces, slow will be the rate of evaporation .
(a) Stronger
(b) Average
(c) Weaker
(d) None of these
Show Answer

Weaker


67. Different liquids have different rate of evaporation at the _______ temperature .
(a) Same
(b) Different
(c) Own
(d) None of these
Show Answer

Same


68. Water has strong intermolecular forces than _______ therefore alcohol can evaporate quickly than water.
(a) Benzene
(b) Alcohol
(c) Hexane
(d) None of these
Show Answer

Alcohol


Vapour Pressure

69. The pressure exerted by the vapours of the liquid when the rate of evaporation becomes equal to the rate of _____ is called vapour pressure.
(a) Condensation
(b) Temperature
(c) Freezing point
(d) None of these
Show Answer

Condensation


70. When a liquid is placed in container, kinetic energies of all the molecules are _______
(a) Same
(b) Comparable
(c) Different
(d) None of these
Show Answer

Different


71. When rate of evaporation increases, the rate of condensation also ________
(a) Decreases
(b) Increases
(c) No change
(d) None of these
Show Answer

Increases


72. When the rate of evaporation becomes equal to the rate of condensation , this state is called an ______ state .
(a) Equilibrium
(b) Hyperbolic
(c) Allotropic
(d) None of these
Show Answer

Equilibrium


73. The pressure exerted by the vapours of a liquid in equilibrium state is called _______
(a) Diffusion
(b) Vapour pressure
(c) External pressure
(d) None of these
Show Answer

Vapour pressure


74. Polar liquid having high ______ points exert little vapour pressure at a given temperature.
(a) Boiling
(b) Melting
(c) Freezing
(d) None of these
Show Answer

Boiling


75. _________ liquids having low boiling points exert more vapour pressure at same temperature .
(a) Polar
(b) Non-polar
(c) Ionic
(d) None of these
Show Answer

Non-polar


76. Water has less vapour pressure then _____ at the same temperature.
(a) Acetone
(b) Ketone
(c) Acetic acid
(d) None of these
Show Answer

Acetone


77. Those liquids which have ______ size are easily evaporated.
(a) Large
(b) Moderate
(c) Small
(d) None of these
Show Answer

Small


78. The temperature which vapour pressure of liquid becomes equal to the atmospheric pressure is called _______
(a) Boiling point
(b) Melting point
(c) Freezing point
(d) None of these
Show Answer

Boiling point


79. ______ have higher boiling point.
(a) Non-polar
(b) Polar
(c) None
(d) None of these
Show Answer

Polar


80. In polar liquids, there are _____ intermolecular forces of attraction than non-polar liquids.
(a) Stronger
(b) Average
(c) Weaker
(d) None of these
Show Answer

Stronger


81. The external pressure is _______ proportional to the boiling point.
(a) Inversely
(b) Constant
(c) Directly
(d) None of these
Show Answer

Directly


82. At high attitude, the boiling point of a liquid will be less because ________ is lower.
(a) Internal pressure
(b) External pressure
(c) Diffusion
(d) None of these
Show Answer

External pressure


83. The temperature at which the liquid and solid state exists in equilibrium state is called ______ point .
(a) Freezing
(b) Boiling
(c) Melting
(d) None of these
Show Answer

Freezing


84. Diffusion in liquid is ______ than diffusion in gases.
(a) Faster
(b) Moderate
(c) Slower
(d) None of these
Show Answer

Slower


Solid State

85. In _______ state of matter the particles are closely packed in a fixed pattern.
(a) Solid
(b) Liquid
(c) Gas
(d) None of these
Show Answer

Solid


86. Solid particles possess only _____ motion .
(a) Random
(b) Vibrational
(c) Rotational
(d) None of these
Show Answer

Vibrational


Typical Properties of Solids

Volume and Shape

Melting Point

Rigidity

Density

87. Solid state has a _____ shape and volume.
(a) Definite
(b) Indefinite
(c) None
(d) None of these
Show Answer

Definite


88. The temperature at which the solid starts melting and exist in dynamic equilibrium with liquid state is called ____ point .
(a) Freezing
(b) Boiling
(c) Melting
(d) None of these
Show Answer

Melting


89. Which one has the higher density ?
(a) Solid
(b) Liquid
(c) Gas
(d) None of these
Show Answer

Solid


Types of Solids

Amorphous Solids

Crystalline Solids

90. The solid in which the particles are not arranged in ______ dimensions is called amorphous solid.
(a) One
(b) Three
(c) Two
(d) Five
Show Answer

Three


91. All are the examples of amorphous solid EXCEPT :
(a) Glass
(b) Plastic
(c) Candy
(d) Diamond
Show Answer

Diamond


92. The solid in which particles are arranged in regular three dimensional pattern is called _____________
(a) Crystalline solid
(b) Amorphous solid
(c) Polymer
(d) None of these
Show Answer

Crystalline solid


93. ______ is the example of crystalline solid .
(a) Cotton
(b) Butter
(c) NaCl
(d) Rubber
Show Answer

NaCl


Allotropy

Allotropes of Carbon

Structure of Diamond

Structure of Graphite

Structure of Buckyball

94. The existence of an elements in more than one crystalline form is called ______
(a) Allotropy
(b) Mobility
(c) Carbon dating
(d) None of these
Show Answer

Allotropy


95. The temperature at which one allotrope changes into another allotropic form is called ____ temperature .
(a) Allotropic
(b) Transition
(c) Crystalline
(d) None of these
Show Answer

Transition


96. Diamond , graphite , Bucky ball , soot are the examples of allotropes of ________ .
(a) Carbon
(b) Polonium
(c) Radon
(d) None of these
Show Answer

Carbon


Review Exercise Chapter # 5

97. The spontaneous mixing of particles is called :
(a) Evaporation
(b) Sublimation
(c) Diffusion
(d) Boiling
Show Answer

Diffusion


98. Which statement for the particles of solid is not correct :
(a) They move at great speed
(b) They are arranged in regular pattern
(c) There is a very little space between the particles
(d) The force of attraction between the particles are strong
Show Answer

They move at great speed


99. A liquid boils when its vapour pressure becomes equal to :
(a) 760cm of Hg
(b) 1 Pascal
(c) 101.325 kilo Pascal
(d) 0.1 atm
Show Answer

101.325 kilo Pascal


100. The vapour pressure of a liquid increases with the :
(a) Increase of pressure
(b) Increase of temperature
(c) Increase of intermolecular force
(d) Increase of polarity of molecules
Show Answer

Increase of temperature


101. Water normally boils at 100^0C but it is possible to boil at 50^0C which variable would you have to change to do this :
(a) Increase external pressure
(b) Decrease external pressure
(c) Increase surface area
(d) Decrease surface area
Show Answer

Increase surface area


102. The vapour pressure of a liquid in a closed container depends upon :
(a) Amount of liquid
(b) Surface area of the liquid
(c) Temperature
(d) Both b and c
Show Answer

Temperature


103. Which one of the following is not an example of amorphous solid :
(a) Rubber
(b) Glass
(c) Glucose
(d) Plastic
Show Answer

Glucose


104. At freezing point which one of the following coexist inn dynamic equilibrium :
(a) Gas and solid
(b) Liquid and gas
(c) Liquid and solid
(d) All of these
Show Answer

Liquid and solid


105. Ink spreads inn water because of :
(a) Vapour pressure
(b) Expansion
(c) Diffusion
(d) Compressibility of water
Show Answer

Diffusion


106. What will be the pressure of gas , if the volume of the gas at 2 atmospheres it increased from 1.5 dm^3 to 3 dm^3
(a) 1 atmosphere
(b) 1.5 atmosphere
(c) 2 atmosphere
(d) 2.5 atmosphere
Show Answer

1 atmosphere


Chemistry Class 9 MCQs (All Chapters)


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