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Chemistry - Structure of Atom

Practise 218 AP EAMCET previous year questions on Structure of Atom, compiled from papers spanning 2001 to 2025. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AP EAMCET tests.

Structure of Atom has been asked in 24 of the 24 years of AP EAMCET papers analysed (2001–2024), with 218 questions in all. 55% of them were easy, 39% moderate and 7% tough. Most of its questions came from 2021, with 34 questions that year. In the last three years (2022–2024) it had 56 questions across 28 papers, about 2 per paper.

The chapter's 7 topics are not weighted equally: Dual Behaviour of Matter and Heisenberg Uncertainty Principle (77 questions, 35%), Quantum mechanical model (35 questions, 16%), and Bohr's model (32 questions, 15%) have been asked the most. Dual Behaviour of Matter and Heisenberg Uncertainty Principle has also led over the last five years, with 38 questions. Dual Behaviour of Matter and Heisenberg Uncertainty Principle has produced the most tough questions (7).

  1. 1The wavelength of a particular electron transition for is 100 nm. The wavelength (in ) of H atom for the same transition is27 May, 2025 (M)Hydrogen spectrum
  2. 2The energy of second Bohr orbit of hydrogen atom is -3.4 eV. The energy of the fourth Bohr orbit of the ion will be27 May, 2025 (M)Bohr's model
  3. 3The work function of Cu is . If photons of wavelength 221 nm are made to strike the surface of the metal, the kinetic energy (in J) of the e26 May, 2025 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  4. 4In an element with atomic number , the number of electrons with ( ) value equal to 3 and 4 are and respectively. The value of is26 May, 2025 (M)Electronic configuration
  5. 5are electromagnetic radiations. Frequencies of are , , respectively, whereas wavelength of c, d are , respectively. The increasing order of 26 May, 2025 (E)Hydrogen spectrum
  6. 6The number of electrons with magnetic quantum number, in the elements with atomic numbers and are respectively26 May, 2025 (E)Quantum mechanical model
  7. 7Which of the following represents the wavelength of spectral line of Balmer series of ion? Rydberg constant,24 May, 2025 (M)Hydrogen spectrum
  8. 8The work functions (in eV ) of respectively are 3.7, 4.8, 4.3, 2.3. From how many metals, the electrons will be ejected if their surfaces ar24 May, 2025 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  9. 9The radius of fourth orbit in ion is ' ' pm and radius of third orbit in ion is ' ' pm. The value of in pm is23 May, 2025 (M)Bohr's model
  10. 10The deBroglie wavelengths of two fast moving particles are respectively. Mass of is nine times the mass of . The ratio of kinetic energies o23 May, 2025 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  11. 11The uncertainty in the velocities of two particles A and B are 0.03 and 0.01 respectively. The mass of is four times to the mass of . The ra23 May, 2025 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  12. 12The total maximum number of electrons possible in and 4 f orbitals with (magnetic quantum number) value -2 is23 May, 2025 (E)Quantum mechanical model
  13. 13The wavenumber of the first line in the Balmer series of hydrogen is . What is the wavenumber (in ) of the second line ( ) in the Balmer ser22 May, 2025 (M)Hydrogen spectrum
  14. 14Which of the following sets of quantum numbers is not possible for the electron?22 May, 2025 (M)Quantum mechanical model
  15. 15The difference between the radii of and orbit of H -atom is . The difference between the radii of and orbit of ion is is equal to22 May, 2025 (E)Bohr's model
  16. 16The de Broglie wavelength of an electron in the third Bohr orbit of H-atom is22 May, 2025 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  17. 17When a metal surface is irradiated with light of frequency , the kinetic energy of emitted photoelectrons is . When the same metal is irradi21 May, 2025 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  18. 18Identify the correct statements from the following I) Isotopes of an element show different chemical behaviour II) Lyman series of lines of 21 May, 2025 (M)Hydrogen spectrum
  19. 19The uncertainty in the position of electron is approximately 100 pm. The uncertainty in momentum (in ) of an electron is21 May, 2025 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  20. 20Which of the following statements are correct? I) The energy of hydrogen atom in its ground state is -13.6 eV II) On the basis of Bohr's mod21 May, 2025 (E)Bohr's model
  21. 21The sum of number of angular nodes and radial nodes for 4 d orbital is23 May, 2024 (M)Quantum mechanical model
  22. 22If the position of the electron was measured with an accuracy of +0.002 nm . the uncertainty in the momentum of it would be (in23 May, 2024 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  23. 23If the longest wavelength of spectral line of Paschen series of ion spectrum is , then the longest wavelength (in ) of Lyman series of hydro22 May, 2024 (M)Hydrogen spectrum
  24. 24If is the threshold frequency of a metal X , the correct relation between de Broglie wavelength associated with photoelectron and frequency 22 May, 2024 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  25. 25The de Broglie wavelength of an electron with kinetic energy of 2.5 eV is (in m )22 May, 2024 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  26. 26The ratio of ground state energy of is22 May, 2024 (E)Bohr's model
  27. 27The energy of third orbit of ion (in J ) is21 May, 2024 (M)Bohr's model
  28. 28The difference in radii between fourth and third Bohr orbits of (in m) is21 May, 2024 (E)Bohr's model
  29. 29If and are respectively the threshold wavelength and wavelength of incident light, the velocity of photo electrons ejected from the metal su21 May, 2024 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  30. 30The angular momentum of an electron in a stationary state of is . The radius and energy of that stationary state are respectively20 May, 2024 (M)Bohr's model
  31. 31If uncertainty in position and momentum of an electron are equal, then uncertainty in its velocity is20 May, 2024 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  32. 32The graph between variation of probability density, and distance of the electron from the nucleus, is shown below. This represents20 May, 2024 (E)Quantum mechanical model
  33. 33In the ground state of hydrogen atom. electron absorbs 1.5 times energy than the minimum energy to escape from the atom. The wavelength of t19 May, 2024 (E)Hydrogen spectrum
  34. 34A golf ball of mass ' ' has a speed of , If the speed can be measured within accuracy of , the uncertainty in the position is19 May, 2024 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  35. 35The de Broglie wavelength of a particle of mass 1 mg moving with a velocity of is ( )18 May, 2024 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  36. 36Correct set of four quantum numbers for the valence electron of strontium is18 May, 2024 (M)Quantum mechanical model
  37. 37Which of the following sets of quantum numbers is correct for an electron in orbital?19 May, 2023 (M)Quantum mechanical model
  38. 38Total number of angular nodes of orbitals associated with third shell of an atom is19 May, 2023 (M)Quantum mechanical model
  39. 39The de' Broglie wavelength of a particle is . What is its momentum?18 May, 2023 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  40. 40If the uncertainty in velocity of electron is , the uncertainty in its position is (given: )18 May, 2023 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  41. 41The energy (in J) released when an excited electron of orbit of hydrogen atom returns to its ground state is18 May, 2023 (E)Hydrogen spectrum
  42. 42Identify the region of spectral lines of electromagnetic spectrum, when electron transition takes place from higher energy levels to in atom17 May, 2023 (M)Hydrogen spectrum
  43. 43Maximum number of electrons theoretically possible for an orbit with principal quantum number in an atom is17 May, 2023 (M)Quantum mechanical model
  44. 44The angular momentum of electron in atom in a particular state is . What is the energy in required to excite the electron from this particul17 May, 2023 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  45. 45A photon of wavelength strikes a metal surface. The work function of the metal is . What is the kinetic energy of the emitted photoelectron?17 May, 2023 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  46. 46Which of the following electronic transitions in hydrogen atom will require the highest energy?16 May, 2023 (M)Hydrogen spectrum
  47. 47The laser in an audio compact disc uses light of wavelength . What is the frequency of light emitted by laser?16 May, 2023 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  48. 48Vijayawada FM radio station broadcasts at frequency of 103.4 MHz. The wavelength of the corresponding radio waves (in ) is15 May, 2023 (M)Hydrogen spectrum
  49. 49The minimum number of quantum numbers required to specify an orbital in an atom is15 May, 2023 (M)Quantum mechanical model
  50. 50Which of the following electron arrangement does not obey Hund's rule?15 May, 2023 (E)Electronic configuration

Frequently Asked Questions

1.How many questions are available for Structure of Atom?

This chapter includes 218 questions compiled from AP EAMCET papers spanning 2001 to 2025.

2.Are these questions only from AP EAMCET, or from other exams too?

These are AP EAMCET questions specifically for the Structure of Atom chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Structure of Atom an important chapter for AP EAMCET Chemistry?

Structure of Atom has appeared in 25 of the 25 years of AP EAMCET papers covered here, with 218 questions across 93 papers - about 2 per paper it appears in.

4.What is the difficulty level of Structure of Atom questions in AP EAMCET?

Of the 218 questions analysed for this chapter, 55% are easy, 39% moderate and 7% tough. 2021 had the most, with 34 questions.

5.Which topics in Structure of Atom should I focus on?

These topics have carried the most weightage in Structure of Atom:

  • Dual Behaviour of Matter and Heisenberg Uncertainty Principle - 77 questions (35%)
  • Quantum mechanical model - 35 questions (16%)
  • Bohr's model - 32 questions (15%)
  • Dual Behaviour of Matter and Heisenberg Uncertainty Principle has produced the most tough questions (7).
6.Is Structure of Atom's weightage in AP EAMCET going up or down?

Across all 93 papers analysed, Structure of Atom has averaged about 2.3 questions per paper. In the last three years (2022–2024), that average has stayed about the same, at about 2.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.