Class 11 Chemistry — Chapter 2: Structure of Atom Online Test

1. For hydrogen atom, the ratio of radii of 1st and 3rd orbit is:

2. The number of radial nodes in 5d orbital is:

3. The ionization energy of hydrogen atom in the ground state is:

4. The electronic configuration of neon (Z=10) is:

5. The electronic configuration of helium (Z=2) is:

6. Why do electrons prefer to occupy different orbitals of equal energy before pairing?

7. When two subshells have the same value, the one that fills first is the one with:

8. Which d-orbitals have lobes oriented between the axes (at 45° angles)?

9. The radial probability distribution curve of a 2s orbital shows:

10. The value of is associated with:

11. The azimuthal quantum number primarily determines the:

12. If , how many orbitals are possible in that shell?

13. The three dumbbell-shaped orbitals oriented along x, y, and z axes are:

14. What physical meaning does the wave function itself have?

15. The first line of the Brackett series corresponds to which transition?

16. Which equation represents Einstein’s photoelectric effect?

17. What is the wavelength of a radio wave with frequency ?

18. Which of the following is a correct postulate of Bohr’s atomic model?

19. In Chadwick’s experiment, which element was bombarded with alpha particles to discover the neutron?

20. What conclusion did Rutherford draw from the gold foil experiment?

1. At what minimum value of do p-orbitals first appear?

2. According to Rutherford’s nuclear model, how are electrons arranged?

3. In Bohr’s atomic model, an orbit refers to:

4. Which of the following is NOT true about atomic orbitals?

5. The Lyman series of hydrogen spectral lines lies in which region of the electromagnetic spectrum?

6. Which experiment first gave evidence of electron spin?

7. Which noble gas has the stable configuration [Xe] 6s² 4f¹⁴ 5d¹⁰ 6p⁶?

8. What is the mass of a neutron compared to a proton?

9. Which transition in the hydrogen atom gives the Lyman series?

10. Which direct conceptual weakness led to the rejection of the plum pudding model after scattering experiments?

11. The number of s-orbitals in any shell is:

12. The concept of orbitals replaced the concept of orbits because:

13. What is the total number of orbitals in the second shell ()?

14. Which of the following transition metals also shows an anomalous configuration similar to copper?

15. The radial probability distribution curve of a 2s orbital shows:

16. Which key limitation made the plum pudding model incompatible with atomic emission spectra?

17. Which subatomic particle orbits outside the nucleus?

18. What prevents electrons from spiraling into the nucleus in Bohr’s model?

19. The orientation of p-orbitals in space is given by:

20. How many orbitals are present in the p-subshell?

21. Which of the following spectroscopic phenomena is explained using electron spin?

22. The term “quantum” of light refers to:

23. Which experimental observation most directly contradicted Thomson’s model?

24. Which statement distinguishes orbitals from orbits in terms of dimensionality?

25. The spin quantum number () describes:

26. What is the significance of the spin quantum number in electronic configuration?

27. What physical meaning does the wave function itself have?

28. The orientation of an orbital in space is determined by:

29. Which phenomenon cannot be explained by the wave theory of light?

30. The electron density in an s-orbital is maximum at:

1. Which transition in hydrogen atom produces radiation of frequency ? (h = , 1 eV = )

2. If frequency of incident light equals threshold frequency, then:

3. In Thomson’s experiment, what was the value of e/m ratio obtained for the electron?

4. If , how many orientations of orbitals are possible?

5. Which experimental observation most directly contradicted Thomson’s model?

6. Which reaction represents the production of neutrons in Chadwick’s experiment?

7. Which scientist’s model of the atom is often referred to as the “plum pudding model”?

8. What is the relative charge of a proton compared to an electron?

9. The electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ corresponds to which element?

10. Which gas produced the smallest positive canal ray particle (proton) during Goldstein’s experiments?

11. Which letter notation corresponds to ?

12. Which subatomic particle defines isotopes of an element?

13. The ionization energy of hydrogen atom in the ground state is:

14. The Pfund series of hydrogen corresponds to electron transitions to:

15. The Paschen series of hydrogen lies in which region of the electromagnetic spectrum?

16. Who discovered the neutron?

17. The probability distribution of electrons in an s-orbital depends on:

18. Which orbital is spherical in shape and smallest in size?

19. The electronic configuration of silver (Z=47) is anomalous and written as:

20. Which set of axes represents the orientations of the three p-orbitals?

21. The wavelength of the shortest line in the Lyman series is:

22. The number of angular nodes in any d-orbital is:

23. The stability of half-filled p-subshell is evident in:

24. Which subshell can accommodate a maximum of 14 electrons?

25. Which particle determines the atomic number of an element?

26. The magnitude of orbital angular momentum for a given is:

27. The energy difference between and levels in hydrogen atom is:

28. Which subshell can have a maximum of 14 electrons?

29. Which transition produces the shortest wavelength line in a hydrogen series?

30. Which spectral series of hydrogen lies in the ultraviolet region?

31. The value of is associated with:

32. The electronic configuration of hydrogen (Z=1) is:

33. The wave number () for the first line of Balmer series in hydrogen is:

34. Which shell corresponds to ?

35. For the shell , the possible values of are:

36. What is the charge-to-mass ratio (e/m) of an electron determined by J.J. Thomson?

37. In Young’s double-slit experiment, the distance between slits is , wavelength is , and distance to screen is . The fringe width is given by:

38. The electronic configuration of neon (Z=10) is:

39. Hund’s rule is especially relevant for:

40. Which transition in hydrogen corresponds to the Brackett series?

41. The energy of an orbital depends mainly on:

42. The probability distribution of a p-orbital is:

43. Which postulate accounts for discrete line spectra of hydrogen?

44. Which subshell is filled immediately after in the neutral-atom filling order?

45. Which of the following spectral series has the shortest wavelength limit?

46. After is filled, which orbital is filled next in most atoms?

47. Which scientist measured the charge of an electron after Thomson’s work?

48. Which factor does not affect the kinetic energy of emitted photoelectrons?

49. The actual configuration of molybdenum (Z=42) is:

50. Which principle is closely related to the wave nature of matter proposed by de Broglie?