Structure of Atom Mock Test – Class 11 Chemistry

1. Assertion: The charge on an electron is .
Reason: The elementary charge magnitude is , and the electron carries one negative elementary charge.

2. A record of a neutral particle system is shown below.

For the same number of protons, the cases that are electrically neutral are

3. The mass of a proton is approximately , while the mass of an electron is . The approximate ratio is closest to

4. In a graph description for a hydrogen spectral series, the lines become closer together as the upper level increases while the final level remains fixed. This convergence happens because

5. A photon has wavelength , and another photon has wavelength . If both photons fall on the same metal surface, the difference in their maximum photoelectron kinetic energies is

6. Assertion: Bohr's model explains atomic stability better than Rutherford's model.
Reason: Bohr postulated that electrons in stationary orbits do not radiate energy.

7. A particle beam has the same charge magnitude as an electron but its mass is times the electron mass. Its charge-to-mass ratio compared with the electron's value will be

8. Match the part of Rutherford's arrangement in Column I with its function in Column II.

9. A transition in a hydrogen atom ends at . The spectral series is

10. Planck's quantum theory states that the energy of one photon is

11. The notation is used for a neutron. The superscript mainly represents

12. In a graph of on the y-axis against on the x-axis for electromagnetic radiation in vacuum, the graph is expected to be a straight line because

13. For hydrogen, Bohr's radius relation is . The radius of the third orbit is

14. Rutherford's alpha-particle scattering experiment used a thin metal foil mainly to study how alpha particles behave when they pass through

15. Bohr introduced the idea of stationary states mainly to explain why an electron in an allowed orbit

16. A discharge tube experiment is modified so that an electric field is applied across the path of the rays. The purpose of this modification is mainly to test whether the rays

17. In a discharge tube experiment, the use of low gas pressure is important because it

18. A nucleus contains protons and neutrons. Its proper nuclear notation is

19. A particle has charge . Another particle has charge . The best comparison is that their charge magnitudes are

20. A species has the configuration . If it is known to be , the neutral atom from which it formed had the configuration

21. A paddle wheel placed in the path of cathode rays starts rotating. The observation suggests that cathode rays

22. Cathode rays were found to have the same properties even when the gas in the tube and the cathode material were changed. This observation supports the idea that electrons are

23. Two radiations have frequencies and . According to Planck's relation, the energy of one photon of the second radiation is

24. A beam in Thomson's setup shows strong deflection in fields, and the measured remains constant across different gases. These two facts together support that the beam consists of

25. Use the graph description below.

The graph should be

26. The energy of the th level of hydrogen in Bohr's model is . The negative sign means that the electron

27. A graph is plotted with on the y-axis and on the x-axis using . The slope of the limiting straight line is

28. The expression for nuclear charge means that

29. A neutral atom of an element has electrons. The same atom contains protons because

30. A subatomic particle has relative charge and mass close to . The particle is a

31. A line in a hydrogen spectrum has wave number . Taking and , the photon energy is closest to

32. Read the situation below and answer the question.

The correct comparison is that

33. The notation row below is meant to summarize the charge sign of the three main subatomic particles. Identify the row that is fully consistent.

34. A hydrogen-like ion has . The radius of its orbit compared with the orbit of hydrogen is

35. Assertion: and are isotopes.
Reason: They have the same number of protons but different numbers of neutrons.

36. The species , , , and are called isoelectronic because they have the same

37. Use the arrangement described below. Path P passes far from the nucleus, Path Q passes close to the nucleus, and Path R is directed almost head-on toward the nucleus. The expected deflection order is

38. A hydrogen atom emits radiation when its electron falls from to . Taking and , and using , the emitted photon energy in joule is

39. A reported average atomic mass of an element lies much closer to isotope mass than to isotope mass . The most reasonable conclusion is that

40. The wave number of electromagnetic radiation is defined as

41. A table gives claims about microscopic particles.

The row that is not consistent with Heisenberg's uncertainty principle is

42. A table gives claims about photoelectric emission.

The claim that is not consistent with the photoelectric effect is

43. In the relation , the unit of Planck's constant is

44. For the species , a learner writes protons, neutrons, and electrons. The part that needs correction is the

45. The approximate relative mass pattern of the three basic subatomic particles is best represented by

46. A valid set of quantum numbers for an electron in a orbital is

47. A configuration for a neutral atom is written as . The total number of electrons in the atom is

48. For hydrogen, the level is assigned energy . This level represents

49. A set of observations about cathode rays is listed below.
I. They cast a shadow of an object placed in their path.
II. They rotate a light paddle wheel.
III. They are deflected toward a positive plate.
IV. Their properties depend strongly on the gas used in the tube.
The observation that does not fit cathode rays is

50. A neutral atom has the configuration . A student says it has unpaired electrons because the last superscript is . The correct number of unpaired electrons is