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. In an octahedral field, orbitals pointing directly along the axes experience:

2. The Brackett series of hydrogen lines appears in which region?

3. If the uncertainty in velocity of an electron is , what is the minimum uncertainty in its position? (Mass of electron )

4. The general formula for hydrogen spectral series is:

5. The stopping potential in a photoelectric experiment is directly related to:

6. If the wave number of light is , its wavelength is:

7. The term “maximum multiplicity” in Hund’s rule refers to:

8. Which is the correct configuration for iron (Z=26)?

9. What is the maximum number of electrons that can occupy a single orbital?

10. Which element has a fully filled d-subshell in its ground state configuration?

11. In multi-electron atoms, the order of increasing energy of orbitals is best represented as:

12. What is the condition for allowed orbits in Bohr’s theory?

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

14. Which element has the configuration [Ar] 4s²?

15. What is the general shape of most d-orbitals?

16. According to de Broglie, the wavelength of a particle is given by:

17. How many quantum numbers are required to specify an electron completely in an atom?

18. The maximum number of electrons that can be accommodated in an orbital is:

19. Which of the following quantum numbers decides the shape of an orbital?

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

21. The principal quantum number () primarily describes:

22. Which statement is a limitation of Rutherford’s nuclear model?

23. The Schrödinger wave equation gives information about:

24. Which statement about Schrödinger’s wave equation is correct?

25. Which concept explains the extra stability of half-filled and fully filled subshells?

26. The ground-state electronic configuration of lithium (Z=3) is:

27. The number of angular and radial nodes in a 4p orbital are:

28. The ground-state configuration of chlorine (Z=17) is:

29. In Bohr’s model, the lowest energy state of hydrogen corresponds to:

30. Which of the following best explains the difference between orbit and orbital?

1. Who discovered the neutron?

2. Which statement is a limitation of Rutherford’s nuclear model?

3. Which experiment first gave evidence of electron spin?

4. For a given value of , the maximum number of electrons that can be accommodated is:

5. The Paschen series corresponds to transitions of electrons ending at:

6. In Rutherford’s gold foil experiment, what was the source of alpha particles?

7. The difference between 1s and 2s orbitals is:

8. Which subatomic particle contributes to both the mass and stability of the nucleus but not to the atomic number?

9. Which subatomic particle is positively charged?

10. The electronic configuration of fluorine (Z=9) is:

11. The frequency of radiation emitted when an electron falls from to is given by:

12. Which transition in hydrogen atom emits radiation of the shortest wavelength?

13. Which limitation of Bohr’s model is correct?

14. The maximum number of electrons in the second shell () is:

15. Bohr’s model could not explain the fine structure of hydrogen spectrum because:

16. Which element has a fully filled d-subshell in its ground state configuration?

17. The maximum number of electrons that can occupy all p-orbitals in a given shell is:

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

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

20. The uncertainty in the position of an electron is . What is the minimum uncertainty in its momentum (h = )?

21. Which hydrogen spectral series lies entirely in the visible region?

22. Which of the following statements about the uncertainty principle is incorrect?

23. Which of the following is not a property of cathode rays?

24. The velocity of an electron in the first Bohr orbit of hydrogen is approximately:

25. For a stationary electron, the de Broglie wavelength is:

26. The number of angular nodes in an orbital equals:

27. Which hydrogen series lies in the visible region of the spectrum?

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

29. What fraction of alpha particles were deflected back at angles greater than in Rutherford’s experiment?

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

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

32. If uncertainty in position of an electron is reduced, what happens to the uncertainty in its momentum?

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

34. Upon forming cations for first-row transition metals, electrons are removed first from:

35. Who proposed the dual nature of matter, introducing the concept of matter waves?

36. Which of the following is a correct implication of the uncertainty principle?

37. The maximum number of electrons that a p-subshell can hold is:

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

39. Which is the correct electronic configuration of chromium (Z=24)?

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

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

42. The magnetic quantum number () signifies:

43. The significance of quantum numbers is that they:

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

45. Which element has the configuration 1s² 2s² 2p⁶ 3s² 3p³?

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

47. The maximum number of electrons that can be accommodated in an orbital is:

48. Which statement about Schrödinger’s wave equation is correct?

49. Which of the following statements about p-orbitals is correct?

50. The number of radial nodes in a 4d orbital is: