Structure of Atom Mock Test – Class 11 Chemistry

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

2. The observation that cathode rays are obtained with different gases and different cathode materials supports the conclusion that electrons are

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

4. The Rydberg formula for the wave number of a hydrogen spectral line is

5. Average atomic mass of an element is calculated as a weighted average because naturally occurring samples may contain

6. A line spectrum record for hydrogen is shown below.

The row with the wrong series claim is

7. For a orbital, the number of angular nodes is

8. Match the cathode-ray observation in Column I with the inference in Column II.

9. Use the arrangement described below. An electron is pictured as moving in a circular path around a positive nucleus, just as Rutherford's model imagined. Classical electromagnetic theory is then applied to the moving electron. The expected difficulty is that the electron should

10. The spin quantum number of an electron can have the values

11. A wave diagram is described as follows: Point P and Point Q are two consecutive crests of the same electromagnetic wave. The distance represents

12. In an emission spectrum, a photon is produced when an electron

13. A hydrogen atom emits radiation when an electron falls from to . Given , , and , the correct combination is approximately

14. The principal quantum number mainly gives information about the

15. The radius of the second Bohr orbit of hydrogen is closest to

16. Absorption lines are formed when atoms

17. A photon has frequency . Taking , its energy is closest to

18. Assertion: The de Broglie relation helped support the modern replacement of fixed electron orbits by orbitals.
Reason: If electrons have wave character, describing them only as particles moving in exact circular tracks is incomplete.

19. A graph is drawn for hydrogen-like ions at fixed , with on the y-axis and on the x-axis. The shape of the graph is best described as

20. A hydrogen line is produced by transition to . Its wave number is

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

22. A metal surface is illuminated with radiation whose frequency is already above the threshold frequency. If the intensity of this radiation is increased while its frequency is kept fixed, the maximum kinetic energy of the emitted electrons will

23. A comparison of positive ions in anode rays is given below.

Under identical field conditions, the ion expected to show the greatest deflection is

24. The maximum number of electrons that can have in an atom is

25. For , the total number of orbitals possible in the shell is

26. The pair of quantities that are directly proportional for electromagnetic radiation in vacuum is

27. An atom has and . The number of neutrons in its nucleus is

28. A table lists species of the same element with .

The wrong electron-count claim is

29. In the wave description of electromagnetic radiation, amplitude is most closely related to

30. The speed of electromagnetic radiation in vacuum is represented by

31. An atom has a subshell. Treat the subshell as seven equal-energy orbital orientations with . According to Hund's rule and the Pauli exclusion principle, which description is correct?

32. An electron is accelerated through , and another identical electron is accelerated through . If , the ratio of their wavelengths is

33. A student writes the following relation chain for radiation:

If , , and , the photon energy is closest to

34. The best reason for placing the gas in a glass tube rather than leaving the setup open to air is that the tube

35. The three orbitals in a given shell are commonly labeled

36. When forming from neutral iron, electrons are removed first from

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

38. An electron is described by , , and . The subshell, number of orbitals in that subshell, and maximum electron capacity are respectively

39. A species has atomic number . The number of electrons in this species is

40. A small number of alpha particles were deflected through small angles in Rutherford's experiment. This observation suggests that

41. Read the case below.

The configuration of the ion is

42. A ray in a discharge tube travels from the cathode, forms a shadow, rotates a light paddle wheel, and bends toward a positive plate. The most complete interpretation is that the ray

43. A set of statements about orbitals is given.
Statement I: An orbital is spherical.
Statement II: A subshell has three possible orientations.
Statement III: The number of angular nodes is equal to .

44. A comparison of two atomic-model claims is given below.
Statement I: Thomson's model accounts for overall electrical neutrality of the atom.
Statement II: Thomson's model explains why alpha particles rebound from a tiny dense positive nucleus.

45. A radiation has wavelength . It falls on two metal surfaces with threshold wavelengths and , respectively. The correct conclusion is

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

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

48. The uncertainty relation implies that if is made very small, then

49. The subshell that fills first among and is because

50. A microscopic particle has position uncertainty . Taking and , the minimum uncertainty in momentum is closest to