Structure of Atom Mock Test – Class 11 Chemistry

1. A table combines isotope and ion information.

The pair that represents isotopes with the same ionic charge is

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

3. A hydrogen electron jumps from to . Taking and , the energy of the emitted photon is

4. A natural element has two isotopes: - and -. Its average atomic mass is . The abundance of - is

5. A radiation has wavelength . Its wave number in and frequency in are respectively, taking ,

6. An element has isotopes with masses and . The isotope of mass is abundant. The average atomic mass is

7. A beam of particles passes through an electric field without bending toward either charged plate. If magnetic and other effects are ignored, this observation most strongly suggests that the particles are

8. A transition in a hydrogen-like ion occurs from to . If the ion has , the emitted energy is how many times the energy of the same transition in hydrogen?

9. A discharge tube record gives the observations below.

The best combined conclusion is that cathode rays

10. A set of four quantum numbers is proposed for the last electron in a subshell: . The set is

11. A wave has wavelength in vacuum. Taking , its frequency is

12. For electromagnetic radiation, the energy of one photon depends directly on

13. A proton is best described as a subatomic particle that has

14. A subshell contains how many orbitals?

15. The wave number of electromagnetic radiation is defined as

16. For an -subshell, . Which row correctly gives the allowed values, the number of orbital orientations, and the maximum number of electrons in the complete -subshell?

17. 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

18. Two electromagnetic waves travel in vacuum. Wave P has wavelength , and Wave Q has wavelength . The frequency of P compared with Q is

19. A simplified comparison of charged particles is given below.

The particle with the highest charge-to-mass ratio is

20. The number of angular nodes in a orbital is

21. A photon has wavelength . Taking , , and , its energy is closest to

22. The observation of rays in a discharge tube is considered an evidence-based step in atomic structure because it

23. Two electrons occupy the same orbital in an atom. According to the Pauli exclusion principle, the two electrons must differ in

24. A table gives claims about microscopic particles.

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

25. A neutral atom contains protons in its nucleus. The number of electrons present in the atom is

26. A hydrogen spectrum line has and . The wave number of this limiting line is

27. When cathode rays are passed between two oppositely charged plates, they bend toward the positive plate. This shows that cathode rays are

28. Study the isotope data below.

The average atomic mass is

29. For the two subshells and , the values are both . The subshell filled first is

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

31. The unit of charge-to-mass ratio is

32. Study the following possible charge changes on a small body.

The row with the wrong final charge sign is

33. A table gives four pairs of atoms.

The row with the wrong claim is

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

35. A description says, "An atom is the smallest unit that takes part in ordinary chemical changes, but it has its own internal structure." This statement mainly rejects the older idea that atoms are

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

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

38. The expression for nuclear charge means that

39. The gold foil in Rutherford's experiment had to be extremely thin because

40. An electron has uncertainty in velocity . Taking , , and , the minimum uncertainty in position is closest to

41. In an atom, the extranuclear region is most closely associated with

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

43. A radiation source emits photons of energy . Taking , the photon frequency is

44. The pair and is not a pair of isobars because

45. A student writes as from neutral , . The most precise correction is

46. The relation shows that photon energy is

47. 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.

48. A heated solid gives a continuous spectrum, while excited hydrogen gas gives separated bright lines. The separated lines in hydrogen arise because

49. Thomson's atomic model described the atom as

50. The term "nucleons" refers to