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 azimuthal quantum number () signifies:

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

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

4. The orientation of d-orbitals in space is determined by which quantum number?

5. The splitting of white light into its component colors is called:

6. What does the quantum number in Bohr’s model represent?

7. Which color of visible light diffracts the most?

8. The magnetic quantum number () describes:

9. The wavelength of the second line of Balmer series in hydrogen is approximately:

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

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

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

13. What deflection pattern for α-particles would the plum pudding model predict?

14. Why does the 1s orbital of hydrogen contain only one electron in the ground state?

15. Which of the following shows an anomalous configuration due to fully filled d-subshell?

16. What is the mass of a proton?

17. The ionization energy of He⁺ ion is:

18. For , how many subshells are present?

19. The orientation of orbital is:

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

21. The energy of a photon of frequency is given by:

22. Which type of electromagnetic wave is mainly responsible for sunburn?

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

24. Which statement correctly describes Bohr’s concept of an orbit?

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

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

27. Which is NOT a characteristic of orbitals?

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

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

30. According to Bohr’s model, electrons revolve around the nucleus in:

1. Which quantum number decides the number of orbitals in a subshell?

2. The splitting of white light into its component colors is called:

3. Which orbital will have the maximum number of angular nodes?

4. The speed of electromagnetic waves in a medium is less than in vacuum because:

5. The quantity in Schrödinger’s equation represents:

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

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

8. Why was the concept of orbit replaced by orbital?

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

10. Which type of equation is Schrödinger’s wave equation?

11. If the wavelength of a wave is doubled, its frequency (in vacuum):

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

13. Which statement is correct according to Pauli’s principle?

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

15. The configuration [Ne] 3s² corresponds to:

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

17. Which transition produces the first line of the Balmer series?

18. Which of the following is a direct consequence of Pauli’s exclusion principle?

19. Which unit combination correctly represents frequency?

20. The minimum energy needed to remove an electron from a metal surface is called:

21. X-rays are mainly used in:

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

23. Which of the following is NOT correct about p-orbitals?

24. The value of is associated with:

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

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

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

28. In Bohr’s model, the energy difference between two orbits is given by:

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

30. Which electromagnetic radiation has wavelengths slightly longer than visible red light?

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

32. In Bohr’s orbit model, angular momentum of an electron is quantized as:

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

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

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

36. In Bohr’s model, the energy of the orbit of hydrogen is given by:

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

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

39. The general formula for hydrogen spectral series is:

40. If the velocity of electromagnetic radiation in vacuum is constant, what happens when frequency increases?

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

42. Microwaves are commonly used in:

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

44. Which concept is compatible with Heisenberg’s uncertainty principle?

45. How many p-orbitals exist in each shell where ?

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

47. The orientation of orbital is:

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

49. The spin quantum number () signifies:

50. Which statement correctly describes Bohr’s concept of an orbit?