Structure of Atom Mock Test – Class 11 Chemistry

1. The principal quantum number mainly gives information about the

2. A metal has threshold wavelength . Radiation of wavelength falls on the metal surface. The expected result is

3. 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

4. A proposed electron has . The set is invalid because

5. The electronic configuration represents

6. A sample contains of isotope , of isotope , and of isotope . Taking isotopic masses as , , and , the average atomic mass is

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

8. A proton and an electron have charges and respectively. If one proton and one electron are considered together, their total charge is

9. Atomic emission spectra are line spectra because atoms emit radiation

10. Assertion: Rutherford's model could not explain the stability of atoms.
Reason: A revolving electron should continuously lose energy according to classical theory.

11. A neutral atom has and neutrons. Its atomic number and electron count are respectively

12. The value of for cathode-ray particles was found to be the same even when the gas in the tube and the cathode material were changed. This constancy supports the idea that

13. For the shell , the number of subshells and the total number of orbitals are respectively

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

15. In the wave description of electromagnetic radiation, wavelength refers to

16. Red light and violet light are both visible radiations. Compared with red light, violet light has

17. A compact orbital note says:

The correct identification is

18. A wavelength is reported as . Its wave number in is closest to

19. A neutral atom is represented as . If it forms , and the neutral atom is written as , the ion is best described as having

20. The electronic configuration of , given that neutral sodium has , is

21. A spectrum record lists the sequence as microwave infrared visible ultraviolet. Along this sequence, the frequency generally

22. The reason canal-ray particles depend on the gas in the tube, while cathode-ray particles do not, is that canal rays are associated with

23. A table gives configurations for some species.

The wrong configuration claim is

24. A data record contains three pairs.
I. and
II. and
III. and
The correct classification order for I, II, and III is

25. A mixed data record is shown below.

The photon energy is closest to

26. Assertion: A metal with a larger work function has a higher threshold frequency.
Reason: The threshold relation is , where is constant.

27. Assertion: Bohr's model gives exact circular paths for electrons in atoms.
Reason: Modern quantum mechanics describes electrons using probability distributions rather than fixed classical paths.

28. If Thomson's model had been fully correct, the alpha particles in Rutherford's experiment would most likely have

29. A photoelectric experiment is repeated with the same metal and same frequency above threshold, but the intensity is doubled. The expected change is

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

31. The row that gives the wrong electromagnetic-spectrum comparison is

32. Rutherford's model also failed to explain the line spectrum of hydrogen because it did not include

33. The total number of nodes in an orbital is given by

34. The symbol represents a proton because the superscript indicates

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

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

37. A learner calculates the average of isotopes - and - as , even though the lighter isotope is much more abundant. The weakness in the calculation is that it

38. The need for a model beyond Rutherford's nuclear model arose mainly because Rutherford's model could not explain

39. A proposed orbital-box description for is given below.

The number of unpaired electrons in this arrangement is

40. The wave number of radiation is . Its wavelength in is

41. A cathode-ray particle has charge magnitude and mass . The closest value of its charge-to-mass ratio is

42. A claim says, "A hydrogen electron in is more tightly bound than in , because is larger than ." The correct response is that the electron in

43. A discharge tube gives positive rays whose particles change when the gas inside the tube is changed. The most reasonable explanation is that the rays are made of

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

45. 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

46. The shape of a orbital is best described as

47. The part of Rutherford's model that most directly explains the passage of most alpha particles through gold foil is that

48. Chadwick's experiment is most closely connected with the discovery of the

49. The subshell that fills first among and is because

50. The ground-state configuration of chromium is better represented as rather than because