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. According to Bohr’s quantization rule, the angular momentum of an electron is:

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

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

4. Which relation connects wavelength , frequency , and velocity of electromagnetic waves?

5. Which element has the configuration [Ar] 3d⁵ 4s²?

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

7. The spin quantum number () signifies:

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

9. The energy of an orbital depends mainly on:

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

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

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

13. The energy required to excite an electron in hydrogen atom from to is:

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

15. Which concept replaced Bohr’s fixed orbits due to Schrödinger’s work?

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

17. The maximum number of electrons that can be accommodated in a shell with principal quantum number is:

18. What is the charge of a proton in coulombs?

19. Which device is commonly used to obtain a spectrum of light?

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

21. Which has the highest frequency among electromagnetic waves?

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

23. The three p-orbitals are oriented:

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

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

26. The quantity in Schrödinger’s equation represents:

27. The maximum number of electrons in a p-subshell is:

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

29. The maximum number of electrons that can occupy all five d-orbitals is:

30. Which combination of quantum numbers is not possible?

1. Which experiment indirectly supported Pauli’s exclusion principle?

2. Which graph best represents Einstein’s photoelectric equation?

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

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

5. The visible region of the EM spectrum lies approximately between:

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

7. Which statement best describes Thomson’s “plum pudding” model of the atom?

8. If the velocity of a wave is constant, what happens when the wavelength decreases?

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

10. In Bohr’s orbit, electrons are assumed to:

11. Who discovered canal rays (positive rays) leading to the discovery of the proton?

12. How many maximum electrons can occupy a single orbital?

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

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

15. Which of the following statements about s-orbitals is correct?

16. The Balmer- line (H) in the hydrogen spectrum is produced by the transition:

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

18. The principal quantum number () primarily describes:

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

20. How many orientations are possible for f-orbitals?

21. Which of the following elements has the configuration [He] 2s² 2p²?

22. The anomalous electronic configuration of niobium (Z=41) is:

23. What is the relative mass of a proton compared to an electron?

24. The orientation of an orbital in space is given by:

25. The energy of an electron in the hydrogen atom is proportional to:

26. In classical mechanics, both position and momentum can be measured exactly. Why not in quantum mechanics?

27. The spin quantum number () signifies:

28. For an atom with embedded electrons in Thomson’s model, which expresses charge neutrality?

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

30. What is the velocity of a wave with frequency and wavelength ?

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

32. Which postulate explains the stability of atoms?

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

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

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

36. If , what is the only possible value of ?

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

38. Which of the following quantum numbers emerge from solving Schrödinger’s equation for the hydrogen atom?

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

40. Which experiment led to the discovery of the nucleus?

41. Bohr’s model fails for heavier atoms because:

42. A stellar spectrum shows strong dark Na “D” lines near and . This most directly indicates:

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

44. Which of the following increases as the principal quantum number increases?

45. Why is copper (Z=29) an exception to the normal Aufbau filling?

46. The ground-state configuration of copper (Z = 29) is:

47. The energy required to remove an electron from level of hydrogen atom is:

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

49. Which has the highest frequency among electromagnetic waves?

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