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Shine your result of the Class 9 Chemistry Board Exam and Entry Test through the most important MCQs on "Structure of Atom"

"Unlock Your Potential in Chemistry with Structure of Atom MCQs for Grade IX: Are you preparing for Board of Intermediate and Secondary Education System, Federal Board Examinations, or entry tests such as NEET, NMDCAT, ETEA, CSS, PMS, NTS, and CTS? Do you want to score high marks in Chemistry and build a strong foundation in the fundamental concepts of the Structure of Atoms? Look no further! This comprehensive guide covers the key topics and subtopics of the Structure of the Atom, including Dalton's atomic theory, Rutherford's experiment, Neil Bohr's atomic theory, fundamental particles of the atom, electronic configuration, energy levels and sub-levels, isotopes, and their uses. With a focus on practice, this article offers a wealth of MCQs to help students excel in Chemistry exams and achieve their full potential. Start preparing today and take your knowledge of the Structure of Atoms to the next level!"
Chemistry MCQs on Structure of Atom -I for Class 9 and Entry Tests
Chemistry MCQs on Structure of Atom - I for Class 9 and Entry Tests
From MCQs Library of H.E.S (Health, Education, and Skills)

MCQs on Dalton's Atomic Theory

1. In which year did John Dalton present his famous theory about the structure of the atom?

A. 1808
B. 1908
C. 1806
D. 1809

2. What is the name of the book in which John Dalton presented his atomic theory?

A. "A new system of chemical reactions"
B. "Atomic structure and properties"
C. "A new system of chemical philosophy"
D. "The basics of modern Chemistry"

3. According to Dalton's theory, what is matter made of?

A. Large visible particles
B. Indivisible and invisible particles
C. Compounds
D. Simple elements

4. Can atoms be created or destroyed according to Dalton's theory?

A. Yes
B. No
C. Undetectable
D. None

5. What causes chemical reactions according to Dalton's theory?

A. Change in properties of atoms
B. Combination or separation of atoms
C. Destruction of atoms
D. Formation of new atoms

6. Was Dalton's theory modified at the end of the 19th century?

A. No
B. Yes

MCQs based on Rutherford's experiment, Rutherford's atomic model, and objections raised on Rutherford's atomic model

7. What were the particles used by Rutherford to study the radiation given out by Polonium?

A. Alpha particles
B. Beta particles
C. Gamma rays
D. Neutrons

8. What was the thickness of the Gold foil used by Rutherford in his experiment?

A. 0.00004 cm
B. 0.0004 cm
C. 0.004 cm
D. 0.04 cm

9. What was the outcome of the experiment for most of the alpha particles?

A. Bounced
B. Deflected at certain angles
C. Passed undeflected
D. Not observed

10. What is the main conclusion of Rutherford's experiment?

A. Atoms consist of only positively charged particles
B. Atoms consist of only negatively charged particles
C. Atoms consist of both positive and negative charged particles
D. Atoms consist of neutral particles

11. What is the name of the central portion of Rutherford's atomic model?

A. Nucleus
B. Proton
C. Electron
D. Neutron

12. What are the particles present in the nucleus of Rutherford's atomic model?

A. Electrons and Protons
B. Protons and Neutrons
C. Electrons and Neutrons
D. Electrons only

13. What is the name of the negatively charged particles in Rutherford's atomic model?

A. Nucleus
B. Proton
C. Electron
D. Neutron

14. What is the motion of electrons in Rutherford's atomic model?

A. Move randomly
B. Move in straight lines
C. Revolve around the nucleus
D. Move toward the nucleus

15. What provides centripetal force to the electrons in Rutherford's atomic model?

A. The attractive force of the nucleus on electrons
B. The attractive force of protons on the nucleus
C. The repulsive force of the nucleus on electrons
D. The repulsive force of electrons on the nucleus

16. What is the size of the nucleus of an atom in Rutherford's atomic model?

A. Equal to the size of an atom
B. Smaller than the size of an atom
C. Larger than the size of an atom
D. Not specified

17. What is the mass of an atom in Rutherford's atomic model?

A. Most of the mass is present in the nucleus
B. Most of the mass is present in the electrons
C. Mass is equally distributed in the nucleus and electrons
D. Not specified

18. What is the charge of an atom in Rutherford's atomic model?

A. Neutral
B. Positive
C. Negative
D. Not specified

19. What was one of the objections raised against Rutherford's atomic model?

A. It is based on neutral bodies
B. It does not explain the chemical properties of elements
C. Electrons do not spiral into the nucleus 
D. All of these

MCQs on Neil Bohr's Atomic Theory

20. What is the main idea of Neil Bohr's atomic theory?

A. Electrons revolve in elliptical paths.
B. Electrons revolve in circular paths around the nucleus.
C. Electrons are located randomly in an atom.
D. Electrons are found outside the nucleus.

21. What is the relation between the energy of an electron and its distance from the nucleus?

A. Inversely proportional
B. Directly proportional
C. No relation
D. Proportional to the square of the distance

22. What happens to the energy of an electron in an orbit according to Bohr?

A. Energy increases
B. Energy decreases
C. Energy remains fixed
D. Energy fluctuates randomly

23. How can the energy change due to electron transition be calculated?

A. Using hv
B. Using h/v
C. Using v/h
D. Using 2hv

24. What determines the residence of electrons in an orbit?

A. Distance from the nucleus
B. Velocity of the electron
C. Angular momentum of the electron
D. Energy of the orbit

25. What is the equation for the angular momentum of an electron in an orbit?

A. mvr = h/2π
B. mvr = 2π/h
C. mvr = nh/2π
D. mvr = 2πh

26. What are the orbits defined by Bohr called?

A. Ellipses
B. Energy levels
C. Shells
D. Both B and C

27. What is the least energetic shell?

A. N-shell
B. K-shell
C. M-shell
D. O-shell

28. What is the value of Plank's constant?

A. 6.6262×10-34 j/sec
B. 6.6262×10-34 kg/m
C. 6.6262×10-34 m/sec
D. 6.6262×10-34 N/m

29. What is the significance of the number 'n' in the equation for the angular momentum of an electron in an orbit?

A. It is the velocity of the electron
B. It is the distance from the nucleus
C. It is the energy of the orbit
D. It is the number of shells

30. What does the term 'shell' in Neil Bohr's atomic theory refer to?

A. The elliptical path followed by electrons
B. The energy levels of electrons in an atom
C. The distance of electrons from the nucleus
D. The velocity of electrons

31. What is the purpose of considering the Hydrogen atom as a model in Neil Bohr's atomic theory?

A. To simplify the theory
B. To generalize the theory
C. To complicate the theory
D. To provide a base for the theory

MCQs on Fundamentals Particles of atom (Electrons, Protons, and Neutrons)

32. What is the charge of an electron?

A. Positive
B. Negative
C. Neutral
D. None of the above

33. Which subatomic particle has the largest mass?

A. Electron
B. Proton
C. Neutron
D. None of the above

34. Where are neutrons present in an atom?

A. In the nucleus
B. Outside the nucleus in orbits
C. Everywhere in the atom
D. None of the above

35. What is the mass of an electron in kilograms?

A. 0.000548597 kg
B. 9.11 x 10-31 kg
C. 1.6726 x 10-27 kg
D. None of the above

36. What is the mass of a neutron in kilograms?

A. 0.000548597 kg
B. 9.11 x 10-31 kg
C. 1.6749 x 10-27 kg
D. None of the above

37. How many times heavier is a proton than an electron?

A. 1 times
B. 9 times
C. 1837 times
D. None of the above

38. How many times heavier is a neutron than an electron?

A. 1 times
B. 9 times
C. 1842 times
D. None of the above

MCQs on Electronic Configuration

39. What is the arrangement of electrons in shells and sub-shells of an atom called?

A. Electronic Structure
B. Electronic Configuration
C. Electron Distribution
D. Shell Arrangement

40. What is the distribution of electrons in shells based on?

A. Electron Number
B. Atomic Number
C. Shell Number
D. Proton Number

41. What is the formula for finding the number of electrons in a shell?

A. n = 2(n)2
B. n = 2n2
C. n = n2
D. n = n2/2

42. How many electrons are present in the 3rd shell?

A. 9
B. 12
C. 18
D. 6

43. What is the theory that explains the distribution of electrons in shells?

A. Quantum Theory
B. Rutherford Theory
C. Bohr Theory
D. Kepler Theory

44. What is the designation of shells in Bohr's atomic theory?

A. K, L, M, N, O
B. X, Y, Z, P, Q
C. A, B, C, D, E
D. R, S, T, U, V

45. What does n represent in the formula for finding the number of electrons in a shell?

A. Electron Number
B. Proton Number
C. Shell Number
D. Atomic Number

46. What is the energy level in an atom?

A. A concentric region around the nucleus where electrons are likely to be found
B. A region within an energy level where electrons are likely to be found
C. The number of shells in an atom
D. The number of electrons in a shell

47. How can we know about the maximum number of electrons that an energy level can accommodate?

A. From the number of isotopes of an atom
B. From the number of electrons in an energy sub-level
C. By the 2n2 rule
D. From the angular momentum quantum number

48. What are energy sub-levels also known as?

A. Electron shells
B. Orbital
C. Energy levels
D. The angular momentum quantum number

49. What are the four sub-shells represented by?

A. Small letters s, p, d, and f
B. Spectroscopic terms sharp, principal, diffused, and fundamental
C. 2n2 rule
D. Angular momentum quantum

50. What is the increasing order of energy of the sub-shells belonging to different shells?

A. 1s<2s<2p<3s<3p<4s<3d
B. 2s<1s<3p<2p<3d<4s
C. 1s<2p<2s<3p<4s<3d
D. 2s<1s<2p<3p<3d<4s

51. What is the Auf Bau principle in atoms?

A.The principle that electrons fill first the highest energy sub-shell available to it and then the lower energy sub-shells
B. The principle that electrons fill the energy levels by using the Bohr's equation
C. The principle that electrons fill first the lowest energy sub-shell available to it and then the higher energy sub-shells
D. The principle that electrons fill the energy sub-levels by using the 2n2 rule

52. What is the first energy sub-shell that electrons fill according to the Auf Bau principle?

A. 3d
B. 4s
C. 1s
D. 2p

53. What is the electronic configuration of Magnesium?

A. 1s2, 2s2, 2p6, 3s1
B. 1s2, 2s2, 2p6, 3s2
C. 1s2, 2s2, 2p6, 3s2, 3p1
D. 1s2, 2s2, 2p6, 3s2, 3p2

54. What is the electronic configuration of Argon?

A. 1s2, 2s2, 2p6, 3s1
B. 1s2, 2s2, 2p6, 3s2, 3p5
C. 1s2, 2s2, 2p6, 3s2, 3p6
D. 1s2, 2s2, 2p6, 3s2, 3p6, 4s1

55. What is the atomic number of Silicon?

A. 11
B. 12
C. 14
D. 15

56. What is the electronic configuration of Calcium?

A. 1s2, 2s2, 2p6, 3s1
B. 1s2, 2s2, 2p6, 3s2
C. 1s2, 2s2, 2p6, 3s2, 3p6, 4s1
D. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2

57. What is the electronic configuration of Sulphur?

A. 1s2, 2s2, 2p6, 3s1
B. 1s2, 2s2, 2p6, 3s2
C. 1s2, 2s2, 2p6, 3s2, 3p4
D. 1s2, 2s2, 2p6, 3s2, 3p5

MCQs on Isotopes and their uses

58. What are Isotopes?

A. Different elements with the same atomic number
B. Atoms of different elements with different atomic numbers
C. Atoms of the same elements with the same atomic number but different atomic masses
D. Both B and C

59. What are the differences among isotopes of the same element?

A. Number of electrons
B. Number of protons
C. Number of neutrons
D. Both the number of electrons and proton

60. Why do isotopes of the same element have the same chemical properties?

A. Same number of electrons
B. Same number of protons
C. Same number of neutrons
D. Both same number of electrons and protons

61. Why do isotopes of the same element have different physical properties?

A. Different number of electrons
B. Different number of protons
C. Different number of neutrons
D. Both different numbers of electrons and protons

62. Isotopes of which elements have the same atomic number?

A. Different elements
B. The same element
C. Different groups of elements
D. Different periods of elements

63. What is the atomic number of all three isotopes of Carbon?

A. 6, 7, 8
B. 12, 13, 14
C. 6, 6, 6
D. 12, 13, 14

64. What is the atomic masses of all three isotopes of Carbon?

A. 6, 7, 8
B. 12, 13, 14
C. 6, 6, 6
D. 12, 13, 15

65. What is the relation between atomic number and atomic masses in isotopes of the same element?

A. Both are the same
B. Both are different
C. Atomic number is the same and atomic mass is different
D. Atomic mass is the same and atomic number is different

66. What is the number of protons in the Chlorine-35 isotope?

A. 17
B. 20
C. 92
D. 53

67. What is the percentage abundance of the Chlorine-37 isotope?

A. 0.05%
B. 0.75%
C. 24.47%
D. 99.245%

68. What is the number of neutrons in the Uranium-235 isotope?

A. 17
B. 20
C. 143
D. 142

69. What is the percentage abundance of the Uranium-238 isotope?

A. 75.53%
B. 0.05%
C. 0.75%
D. 99.245%

70. What is the use of Iodine-131?

A. For the diagnosis of tumors
B. To cure goiter
C. To inspect airline luggage for hidden explosives
D. For the identification of blood circulation problems

71. What is the use of Iodine-123?

A. For the diagnosis of tumors
B. To cure goiter
C. To inspect airline luggage for hidden explosives
D. For brain imaging

72. What are the tracer elements used in biochemical and physiochemical research?

A. Radium and Cobalt-60
B. Heavy Carbon (C-13), heavy Nitrogen (N-15), Iodine-131, and heavy Oxygen (O-18)
C. Sodium (Na-24) and Krypton-85
D. American-241 and Uranium

73. What is the use of Radium and Cobalt-60?

A. To inspect airline luggage for hidden explosives
B. For the treatment of cancer and diagnosis of tumors
C. For brain imaging
D. To trace the path of carbon in photosynthesis

74. What is the use of Sodium (Na-24)? 

A. For the identification of blood circulation problems in patients 
B. For the diagnosis of tumors 
C. To cure goiter 
D. To inspect airline luggage for hidden explosives

75. What is the use of Carbon-14? 

A. To trace the path of carbon in photosynthesis 
B. To inspect airline luggage for hidden explosives 
C. For the treatment of cancer and diagnosis of tumors 
D. For brain imaging

76. What is the use of Americium-241? 

A. To trace the path of carbon in photosynthesis 
B. For brain imaging 
C. In many smoke detectors for homes and businesses and to help determine oil wells 
D. For the identification of blood circulation problems in patients

77. What is the use of Californium-252? 

A. To inspect airline luggage for hidden explosives and measure the moisture content of the soil in road construction and building industries 
B. To cure goiter 
C. For brain imaging 
D. For the treatment of cancer and diagnosis of tumors

78. What is the use of Krypton-85? 

A. In indicator lights in appliances such as clothes washers and dryers, stereos, etc. 
B. To trace the path of carbon in photosynthesis 
C. For the treatment of cancer and diagnosis of tumors 
D. To inspect airline luggage for hidden explosives

79. What elements are used in the Carbon dating of plants and animals? 

A. Sodium (Na-24) and Americium-241 
B. Uranium and Carbon-14 
C. Iodine-131 and Californium-252 
D. Heavy Carbon (C-13), heavy Nitrogen (N-15), and heavy Oxygen (O-18)

80. What is the estimation of the ages of plants and animal remains called? 

A. Carbon dating 
B. Uranium dating 
C. Iodine dating 
D. Americium dating

Answers

1. A 2. C 3. B 4. B 5. B 6. B 7. A 8. A 9. C 10. C 11. A 12. B 13. C 14. C 15. A 16. B 17. A 18. A 19. A 20. B 21. B 22. C 23. A 24. C 25. C 26. D 27. B 28. A 29. D 30. B 31. A 32. B 33. B 34. A 35. B 36. C 37. C 38. C 39. B 40. C 41. B 42. C 43. C 44. A 45. C 46. A 47. C 48. B 49. A 50. A 51. C 52. C 53. B 54. C 55. C 56. D 57. C 58. C 59. C 60. D 61. C 62. B 63. C 64. B 65. C 66. A 67. C 68. C 69. D 70. B 71. D 72. B 73. B 74. A 75. A 76. C 77. A 78. A 79. B 80. A...
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