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

2. How many d-orbitals exist in a given shell?

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

4. What is the ionization energy of hydrogen atom in ground state?

5. What is the total number of nodes in 4p orbital?

6. What is the general shape of p-orbitals?

7. The Balmer series of hydrogen corresponds to transitions ending at:

8. What kind of spectrum is produced when white light passes through a cold gas before entering a spectroscope?

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

10. Which element’s ground-state configuration demonstrates Hund’s rule?

11. Which orbital is non-spherical in shape and has 3 orientations?

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

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

14. Which statement is true about the nodal plane in a p-orbital?

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

16. Which of the following is a stable electronic configuration due to a noble gas structure?

17. Which statement about orbitals is correct?

18. Quantum numbers are used to:

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

20. Which has the highest frequency among electromagnetic waves?

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

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

23. The ratio of velocities of electron in 2nd and 4th orbits of hydrogen atom is:

24. The first line of the Lyman series corresponds to transition:

25. The configuration [Kr] 5s² 4d¹⁰ 5p⁵ corresponds to:

26. What ultimately fixes the position of a spectral line in either emission or absorption?

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

28. The energy of an orbital depends mainly on:

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

30. In transition metal complexes, splitting of d-orbitals into and sets is due to:

1. The energy of an orbital depends mainly on:

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

3. Which of the following represents a stable noble gas configuration?

4. Which is the correct ground-state configuration of sodium (Z=11)?

5. The orientation of orbital is:

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

7. In electromagnetic waves, the electric field vector is always:

8. Who discovered the neutron?

9. Which subatomic particle has the smallest mass?

10. The number of atomic orbitals in the shell is given by:

11. The spin quantum number () describes:

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

13. Which rule is based directly on quantum numbers to fill atomic orbitals?

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

15. Which drawback of Rutherford’s model was highlighted by classical electromagnetic theory?

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

17. Which quantities are related by the time–energy form of uncertainty principle?

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

19. Which element has the configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²?

20. What was the major drawback of Dalton’s Atomic Theory?

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

22. Which experiment first gave evidence of electron spin?

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

24. Which statement about electromagnetic waves is correct?

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

26. The line at 656 nm in hydrogen spectrum corresponds to which transition?

27. Which electromagnetic theory of light was given by Maxwell?

28. What is the ionization energy of hydrogen atom in ground state?

29. What is the shape of an s-orbital?

30. Which parameter of a wave is directly proportional to photon energy?

31. Which principle is directly related to the spin quantum number?

32. Which of the following is a major limitation of Bohr’s model?

33. Why are half-filled and fully filled subshells more stable?

34. For hydrogen atom, the energy of electron in 3rd orbit is:

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

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

37. The ground-state configuration of chromium (Z = 24) is:

38. Which of the following could not be justified by Bohr’s model?

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

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

41. What was the key observation from Rutherford’s gold foil experiment?

42. The effective nuclear charge experienced by a 2p electron in oxygen atom (Z=8) using Slater’s rules is approximately:

43. The electronic configuration of oxygen (Z=8) can be written as:

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

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

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

47. The Schrödinger wave equation gives information about:

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

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

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