Chemistry - Atomic Structure:

1. Which of the following orbital have dum-bell shape: a) P b) S c) f d) d

2. When the electron is brought from infinity to the ground state of hydrogen atom, then the energy is: a) Emitted b) Absorbed c) Depends on surrounding d) Not effected

3. Discharge tube experiments were performed at low pressure to discover the presence of : a) Nucleus b) Neutrons c) Atomic charge d) Electrons & Protons

4. Hydrogen ion is called: a) Neutron b) Nucleon c) Proton d) Electron

5. The rays traveled in the opposite direction of cathode rays in a discharge tube are called: a) Positive rays b) Alpha rays c) Cathode rays d) Neutral rays

6. Neutron present in the nuclei of all atoms: a) Wrong b) Correct

7. The charge on the nucleus is : a) No charge b) Positive c) All are correct d) Negative

8. Other then sunlight Continuous spectrum can be obtain from: a) Due to light from a liquid body b) Due to light from a gaseous body c) Due to light from a solid body d) Solid or liquid body

9. The first discovered radioactive material was: a) Phosphorus b) Radium c) Uranium d) Lead

10. X-rays are also called as: a) Anode rays b) Cathode rays c) Roentgen rays d) Alpha rays

11. Atoms of the same element having different atomic masses due to the : a) Presence of neutrons in the nucleus b) Atom c) Proton d) Electron

12. The mass of an atom is: a) Due to protons only b) Spread equally in all regions c) Due to electrons only d) Concentrated in the nucleus

13. The minimum amount of energy which is required to remove an electron from the valence shell in a gaseous state to form positive ion is called: a) Valency b) Electron affinity c) Ionization Potential d) Electro-negativity

14. Atomic nucleus was discovered by: a) John Dalton b) Henry Mosley c) Rutherford d) Madam Curie

15. The word postulate means something assumed true: a) Wrong b) Some times wrong c) Correct d) Some times correct

16. Which postulate about electron from Bohr's theory was considered as wrong: a) Electron loses its energy when revolves b) Electron has same energy in all orbits c) Electron emits energy when jumps from lower to higher orbit d) Electron gains energy

17. The sub-shell that can accommodates maximum 14 electrons in it, is called: a) d - Orbital b) S - Orbital c) f - Orbital d) k - Orbital

18. If an atom contains 19 electrons, 19 protons and 20 neutrons then the mass number of this atom will be: a) 58 b) 29 c) 39 d) 38

19. Mass of neutron is slightly more than the mass of: a) Electron b) Proton c) Atom d) Mole

20. The region of visible spectrum are: a) Three b) Nine c) Four d) Seven

21. The circular path around the nucleus on which electron revolves are called: a) Round b) Circle c) Orbit d) Nucleus

22. According to classical theory, when an electron revolves its energy: a) Increases b) Decreases c) First increase then decrease d) Remains same

23. Atoms of the same element will have same: a) atomic mass b) Neutron c) None of these d) Atomic Number

24. An element in ionic form has 18 electrons and 20 neutrons while the charge on it is + 2, its mass number will be: a) 40 b) 39 c) 42 d) 38

25. The particle which carries positive charge is: a) Electron b) Atom c) Neutron d) Proton

26. The Phenomena of radioactivity was discovered by: a) John Dalton b) Madam Curie c) Henry Mosley d) Ruther ford

27. The total number of protons and neutron in the nucleus are called: a) Mole b) Atomic charge c) Atomic number d) Atomic mass

28. Discharge tube experiment helps in the discovery of: a) Electron & proton b) Electron c) Proton d) Nucleus

29. Cathode rays are deflected by: a) Magnetic field b) Electric field c) Electric and Magnetic fields d) None of these

30. The mass of proton is equal to the mass of : a) Oxygen nucleus b) Carbon nucleus c) Helium nucleus d) Hydrogen nucleus

31. In energy level N, there are: a) Two- sub shells b) Eight sub-shells c) Three sub-shells d) Four sub-shells

32. The number of orbital in P sub-shells are: a) 10 b) 1 c) 3 d) 2

33. Excited state of an atom is: a) Neutral b) Unstable c) Normal condition d) Stable

34. According to bohr's the energy of first orbit is: a) Higher than other orbits b) Same as other orbits c) Always changes from higher to lower d) Lowest as compared to other orbits

35. Neutron was discovered when Beryllium was bombarded with: a) Alpha particles b) None of these c) Beta particles d) Gamma particles

36. The maximum number of electrons in a sub-shell for which l= 3 is: a) 14 b) 6 c) 10 d) 4

37. Cathode rays are the beams of: a) Neutron b) Atoms c) Electron only d) Proton

38. If the beam of sunlight is passing through the prism, then the type of spectrum obtained is: a) Line Spectrum b) Band Spectrum c) Absorption Spectrum d) Continuous Spectrum

39. The radius of first orbit of hydrogen atom is : a) 0.329A b) 0.249A c) 0.2249A d) 0.529A

40. The most electronegative element is: a) Fluorine b) Iodine c) Bromine d) Chlorine

41. Cat-ions radii is: a) None of these b) Smaller than the neutral atom c) Larger than the neutral atom d) Same as neutral atom

42. An important scientific tool which is used for the study of fundamental particles of an atom and contains electrodes filled with gas is called as: a) Filament of bulb b) Discharge tube c) Electric tube d) Pressure tube

43. An Electron is : a) Heaviest particle of an atom b) Smallest particle of an atom contains negative charge c) Carries Positive charge d) Neutral particle

44. The speed of Alpha rays is about : a) 1/20 th of speed of light b) 1/8 th of speed of light c) 1/10 th of speed of light d) 1/100 th of speed of light

45. Goldstein discovered that besides the cathode rays another type of rays are produced in discharge tube which are called: a) Gamma rays b) Beta rays c) Positive rays d) Alpha rays

46. Atoms of the same element having same atomic number but different atomic masses are called: a) Mole b) Isotopes c) Gram atom d) Charged atom

47. Lyman series of spectral lines appear in the position of: a) Visible Spectrum b) Infrared Spectrum c) All are correct d) Ultraviolet Spectrum

48. The minimum mass of positive rays particle equals to: a) Oxygen nucleus b) Neutron c) Hydrogen ion d) Electron

49. The radioactive elements have been discovered so far: a) 110 b) 40 c) 10 d) 30

50. In electron transition the unit of energy is : a) Joule b) Quantum c) Farad d) Coulomb

51. In a chemical reaction atom : a) Does not divide b) Only some times divide c) Always divide d) None of these

52. When the azimuthal quantum number l=3, then magnetic quantum number m will have: a) 9 values b) 7 values c) 5 values d) 3 values

53. A-ionic radii is : a) Smaller than neutral atom b) Greater than neutral atom c) Same as neutral atom d) None of these

54. Beta rays consist of: a) Stream of electron b) Atoms c) Proton d) Neutrons

55. If an object is placed in the direction of cathode rays, then: a) Object starts shining b) Shadow of that object appears c) Object becomes dull d) Light reflects from it

56. Balmer series lie in the region of: a) Ultraviolet b) Infra-infrared c) Infrared d) Visible Spectrum

57. In discharge tube the emission of cathode rays requires: a) High pressure and high potential b) Low pressure & high Potential c) None of these d) Low potentail & low pressure

58. The radio active radiations which are used for ionization of gases are: a) Alpha radiations b) Beta radiations c) Gamma radiations d) None of these

59. Which of the following statement is not true about cathode rays: a) Negatively charged particle b) A stream of electrons c) Can be deflected by magnetic field d) Move with the speed of light

60. The value of Rydberg's constant is: a) 1.09678 cm b) 109678 nm c) 10.9786 m d) 109678 per cm

61. The minimum amount of energy which is released from a gaseous atom when an electron is added in the valence shell to form negative ion or an-ion is called: a) Ionization potential b) Valency c) Electro-negativity d) Electron Affinity

62. When alpha particles are bombarded on a stable element, its nucleus is disintegrated and it emits radiations. This is known as: a) None of these b) Natural radioactivity c) Artificial radioactivity d) Both of these

63. Which of the following statement about electron is wrong: a) Its motion is effected by magnetic field b) It emits energy while revolving in orbit c) It is a particle d) It has wave like property

64. Rutherford's experiment on scattering of alpha particles showed that: a) Atom has electrons b) Atom has nucleus c) Atom has neutrons d) Atom has protons

65. In which direction cathode rays travel: a) About 120 degree b) Perpendicular direction to the cathode c) Parallel direction d) About 180 degree

66. The spectrum in which the colours are so diffuse so that the boundary lines are not distinctly marked is called as: a) Visible Spectrum b) Line spectrum c) Atomic spectrum d) None of these

67. Two electron in the same atom can not have the identical set of four quantum numbers, this statement is called as: a) Aufbau's principle b) (n+l) rule c) Hund's Rule d) Pauli's Exclusion principle

68. The nature of positive rays depends upon: a) Nature of electrodes b) None of these c) Nature of gas filled in the discharge tube d) Nature of discharge tube

69. In cathode tube electron and proton move in: a) Perpendicular to each other b) Opposite direction c) None of these d) Same direction

70. The radius of Second Bohr's orbit is: a) 0.053 x 4 nm b) 0.053 nm c) 0.029 nm d) 2 X 0.053 nm

71. When alpha particles are bombarded on a thin gold foil, most of them pass through the foil because: a) Alpha particles are positively charged b) Alpha particles move in striaght line c) Most of the atomic space is empty d) Alpha particles are heavy

72. According to Bohr's atomic model when electrons revolve in stationary orbits: a) There is no change or loss of energy b) Their energy increases c) Their Kinetic energy increases d) They become stationary

73. The neutral particle of an atom is: a) Nucleus b) Electron c) Proton d) Neutron

74. Foggin on the photographic plate is caused by: a) Radioactive substances b) Proton c) Electron d) Neutral particles

75. Positive rays carries: a) Positive Charge b) None of these c) Neutral rays d) Negative Charge

76. The colour of the glow in the discharge tube depends upon: a) Electrodes b) Material of discharge tube c) Gas inside the tube d) None of these

77. The number of protons or electron present in a neutral atom is called: a) atomic mass b) Atomic number c) Atomic charge d) Mole

78. Madam Curie discovered: a) Bismuth b) Polonium c) Uranium d) Radium

79. The number of sub-shells present in a shell is equal to: a) Planck's quantum number b) Frequency of electron c) Angular momentum d) Principal quantum number

80. The ions which have the same electronic configuration are called: a) Isotopes b) Isomers c) Iso-electronic d) Isotones

81. The orbital having same energy are called: a) Hybrid orbital b) Valence orbital c) D- orbital d) Degenerated orbital

82. The rays emitted from the cathode in a discharge tube are called: a) Cathode rays b) Positive rays c) None of these d) Discharge tube rays

83. Neutron was discovered by: a) James Chadwick b) Henry Mosley c) Rutherford d) Madam Curie

84. Central part of an atom is called as: a) Proton b) Nucleus c) Neutron d) Electron

85. Maximum number of electrons in a sub-shell can be obtain by the formula of: a) 2l-1 b) 2l c) 2(2l-1) d) 2(2l+1)

86. The e/m of positive rays depends upon: a) Nature of electrodes b) Nature of gas filled in the discharge tube c) Nature of discharge tube d) None of these

87. Electrons always occupy the lower energy orbital first was put forward by: a) Aufbau b) Rutherford c) Bohr's d) Henry Mosley

88. Subsidiary quantum number specifies: a) Nuclear stability b) Size of the orbital c) Shape of the orbital d) Orientation of orbital

89. The electromagnetic nature belongs to: a) Beta rays b) Alpha rays c) None of these d) Gamma rays

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