The 9th Class Chemistry Chapter 05 MCQs with Answers: “The Physical States of Matter” invites us to explore the fascinating world of matter and its different states. Within this enlightening chapter, we delve into the properties, characteristics, and behavior of solids, liquids, and gases.
9th Class Chemistry Chapter 05 MCQs with Answers
Prepare to embark on a captivating journey where we unravel the mysteries of matter and its physical states. We delve into the understanding of solids, learning about their definite shape and volume, as well as their strong intermolecular forces that hold their particles in a fixed arrangement. As we delve deeper, we encounter the concept of crystalline and amorphous solids, understanding the differences in their particle arrangement and properties.
Our exploration extends to the concept of liquids, which have a definite volume but no definite shape. We learn about the weaker intermolecular forces that allow the particles in liquids to move more freely. We delve into the concepts of viscosity, surface tension, and evaporation, understanding how they influence the behavior and properties of liquids.
The chapter further unveils the concept of gases, which have neither a definite shape nor a definite volume. We explore the kinetic molecular theory, understanding how the particles in gases are in constant motion and have negligible intermolecular forces. We learn about gas laws, including Boyle’s law, Charles’s law, and the ideal gas law, which describe the relationships between pressure, volume, temperature, and the number of moles.
Through practical examples, diagrams, and problem-solving exercises, we enhance our understanding of the physical states of matter. We sharpen our ability to analyze and interpret the behavior and properties of solids, liquids, and gases. We unlock the ability to unravel the mysteries of matter and apply this knowledge to real-world situations.
Studying “The Physical States of Matter” in the 9th Class Chemistry curriculum fosters critical thinking skills, analytical reasoning, and a deeper understanding of the principles that govern the behavior of matter. It equips us with the tools to comprehend and appreciate the different states of matter, their properties, and their transformations. So let us embark on this enlightening journey, where we explore the captivating realm of matter’s physical states, unraveling the secrets of its behavior and expanding our understanding of the dynamic world of chemistry.
What are The physical States of Matter?
The three states of matter are the three distinct physical forms that matter can take in most environments: solid, liquid, and gas. In extreme environments, other states may be present, such as plasma, Bose-Einstein condensates, and neutron stars.
9th Class Chemistry Chapter 05 MCQs: The physical States of Matter
1. Which among the following expand or compressed easily
(a) Liquid
(b) Gases
(c) Solids
(d) Water
2. Diffusion is faster in:
(a) Liquid
(b) Solids
(c) Gases
(d) Plasma
3. Gases exerts pressure in all directions
(a) Uniformly
(b) Randomly
(c) Alternately
(d) Constantly
4. Which principle is applicable in a working pressure cooker?
(a) Boiling point will be more by increasing the external pressure
(b) Boiling point will be less by decreasing the external pressure
(c) Boiling point will be more by increasing the external pressure
(d) None of these
5. Red phosphorus is:
(a) Less reactive
(b) Non-poisonous
(c) Brittle
(d) All of above
6. Which of the following percentage of salt is required to kill the bacteria?
(a) 10%
(b) 20%
(c) 30%
(d) 40%
7. The density of gold is:
(a) 2.70 gcm3
(b) 7.86 gcm3
(c) 9.3 gcm3
(d) 2.98 gcm3
8. The solids in which particles are arranged in definite three-dimensional pattern are known as:
(a) Solids
(b) Crystalline solids
(c) Amorphous solids
(d) both ‘B’ and ‘C’
9. The transition temperature of tin is:
(a) 96°C
(b) 250°C
(c) 18°C
(d) 100°C
10. Oxygen has two allotropic forms:
(a) O2 and O4
(b) O2 and O3
(c) O and O3
(d) O2 and O
11. Plastics, glass rubber, lamp-black etc. are the examples of:
(a) Crystalline solids
(b) Supercooled liquids
(c) Amorphous solids
(d) Ionic solids
12. The temperature at which the solid and liquid phases of a substance co-exist is known as :
(a) Freezing point
(b) Boiling point
(c) Melting point
(d) Equilibrium
13. The presence of solid in different physical forms is known as:
(a) Crystals
(b) Allotropy
(c) Evaporation
(d) Transition
14. Among the following which depends upon the nature of liquid, intermolecular forces and external pressure.
(a) Melting point
(b) Freezing point
(c) Boiling point
(d) None of these
15. The conversion of a liquid into vapours at all temperature is known as .
(a) Evaporation
(b) Boiling
(c) Cooling process
(d) Both ‘A’ and ‘C’
16. Density is expressed in:
(a) g cm3
(b) g dm3
(c) Both ‘A’ and ‘B’
(d) None of these
17. Charles described, how gases tend to expand when heated:
(a) 1882
(b) 1802
(c) 1820
(d) 1828
18. Mass per unit volume is called:
(a) Pressure
(b) Temperature
(c) Density
(d) Solubility
19. Robert Boyle’s was a natural:
(a) Philosopher
(b) Chemist
(c) Physicist
(d) All of above
20. Matter exists in three physical states:
(a) Solid, liquid, plasma
(b) Solid, water, vapour
(c) Plasma, liquid, solid
(d) Solid, liquid, gas
21. Which one of the following gases diffuse most slowly?
(a) O2
(b) Cl2
(c) NH3
(d) H2
22. Pascal is the SI unit of:
(a) Force
(b) Volume
(c) Momentum
(d) Pressure
23. At 0°C the density of O2 gas is:
(a) 1.5g dm3
(b)1.4g dm3
(c) 4.1g dm3
(d) 0.15g dm-3
24. V/T=K is the mathematical form of:
(a) Boyle’s law
(b) Charles law
(c) Avogendo law
(d) Dalton law
25. -273°C after conversion to Kelvin scale becomes:
(a) OK
(b) 273K
(c) 173K
(d) 100K
26. At which temperature rate of evaporation of water is minimum?
(a) 50°C
(b) 40°C
(c) 90°C
(d) 70.5°C
27. The molecular formula of decane is
(a) C6H14
(b) C7H16
(c) CaH20
(d) C10H22
28. C6H14 is the molecular formula of
(a) Pentane
(b) Hexane
(c) Propane
(d) Decane
29. At a given temperature which of the following has a maximum vapour pressure
(a) C5H12
(b) C6H14
(c) C3H10
(d) C8H18
30. The density of gold is:
(a) 270 gcm
(b) 7.869 cm3
(c) 19.3g cm
(d) 1.4g cm
31. 250°C is the transition temperature of which substance:
(a) Tin
(b) Carbon
(c) Phosphorus
(d) Sulphur
32. The crystal structure of which tin is
(a) cubic
(b) tetragonal
(c) monoclinic
(d) None of these
33. Freezing point of acetic acid is:
(a) -116°C
(b) 16.6°C
(c) -56°C
(d) -115°C
34. The vapour pressure of which liquid is 200mm Hg at 0°C?
(a) Water
(b) Alcohol
(c) Honey
(d) Ether
35. 2×101325 Pa is equal to
(a) 1.56 atm
(b) 2.0 atm
(c) 15.8 atm
(d) 8.15 atm
36. Normal body temperature is
(a) 98.6°F
(b) 37°C
(c) Both a and b
(d) 98.6°C
37. The freezing point of n-octane is
(a) -57°C
(b) 126°C
(c) 34.6°C
(d)-116°C
38. 760 mmHg is equal to
(a) 266 torr
(b) 2660 torr
(c) 626 torr
(d) 1 atm
39. 1 atm has how many pascals?
(a) 151987.5 Pa
(b) 19187.5 Pa
(c) 9187.6 Pa
(d) 101325Pa
40. In which unit density of gases is measured?
(a) kg mm-3
(b) cm-3
(c) gdm-3
(d) gcm-3