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Chemistry - Structure of Atom

Practise 147 TS 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 TS EAMCET tests.

Structure of Atom has been asked in 24 of the 24 years of TS EAMCET papers analysed (2001–2024), with 147 questions in all. 57% of them were easy, 41% moderate and 1% tough. Most of its questions came from 2020, with 18 questions that year. In the last three years (2022–2024) it had 38 questions across 17 papers, about 2.2 per paper.

The chapter's 7 topics are not weighted equally: Dual Behaviour of Matter and Heisenberg Uncertainty Principle (38 questions, 26%), Quantum mechanical model (30 questions, 20%), and Bohr's model (26 questions, 18%) have been asked the most. Dual Behaviour of Matter and Heisenberg Uncertainty Principle has also led over the last five years, with 19 questions. Bohr's model has produced the most tough questions (1).

  1. 1The radius of second orbit of hydrogen atom is same as that of orbit ( n ) of an ion ( x ). n and x are respectively04 May, 2025 (M)Bohr's model
  2. 2An electromagnetic radiation of wavelength 331.5 nm is made to strike the surface of a metal. Electrons are emitted with a kinetic energy of04 May, 2025 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  3. 3Observe the following statements Statement-I : Rutherford model of an atom cannot explain the stability of an atom Statement-II : The wavele04 May, 2025 (E)Atomic Models
  4. 4In hydrogen atom, an electron is transferred from an orbit of radius 1.3225 nm to another orbit of radius 0.2116 nm. What is the energy (in 04 May, 2025 (E)Bohr's model
  5. 5The energy associated with electron in first orbit of hydrogen atom is . The frequency of the light required (in Hz ) to excite the electron03 May, 2025 (M)Bohr's model
  6. 6In , the number of electrons with is , number of electrons with is is equal to ( Azimuthal quantum number)03 May, 2025 (M)Quantum mechanical model
  7. 7In the atomic spectrum of hydrogen, the wavelengths of the spectral lines corresponding to electronic transitions (i) to and (ii) to are and03 May, 2025 (E)Hydrogen spectrum
  8. 8Work functions of four metals and are and 3.75 eV respectively. The metals which do not show photoelectric effect when light of wavelength 303 May, 2025 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  9. 9The radius of stationary state of hydrogen atom is . The radius of stationary state of ion (in pm) is02 May, 2025 (M)Bohr's model
  10. 10When electromagnetic radiation of wavelength 310 nm falls on the surface of a metal having work function 3.55 eV, the velocity of photoelect02 May, 2025 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  11. 11The electron in hydrogen atom undergoes transition from higher orbits to an orbit of radius 476.1 pm. This transition corresponds to which o02 May, 2025 (E)Bohr's model
  12. 12Identify the incorrect statement from the following?02 May, 2025 (E)Quantum mechanical model
  13. 13If represent the principal and azimuthal quantum numbers respectively, the formula used to know the number of radial nodes possible for a gi11 May, 2024 (M)Quantum mechanical model
  14. 14If the radius of first orbit of hydrogen like ion is , the energy associated with that orbit (in ) is11 May, 2024 (M)Bohr's model
  15. 15The wavenumber of first spectral line of Lyman series of ion is . What is the wavenumber (in ) of second spectral line of Balmer series of i10 May, 2024 (M)Hydrogen spectrum
  16. 16The uncertainty in determination of position of a small ball of mass 10 g is . With what of accuracy its speed can be measured, if it has a 10 May, 2024 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  17. 17The wavelength of an electron is . What is its momentum in ? J s)10 May, 2024 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  18. 18Two statements are given below Statement I : In H atom, the energy of 2 s and 2 p orbitals is same Statement II : In He atom, the energy of 10 May, 2024 (E)Electronic configuration
  19. 19Identify the pair of species having same energy from the following (The number given in the bracket corresponds to principal quantum number 09 May, 2024 (M)Bohr's model
  20. 20Which one of the following corresponds to the wavelength of line spectrum of H atom in its Balmer series? ( Rydberg constant)09 May, 2024 (M)Hydrogen spectrum
  21. 21The kinetic energy of electrons emitted, when radiation of frequency hits a metal, is . What is the threshold frequency of the metal (in Hz)09 May, 2024 (E)Hydrogen spectrum
  22. 22The energy of second orbit of hydrogen atom is . What is the energy of first orbit of ion (in )?14 May, 2023 (M)Bohr's model
  23. 23The number of electrons with values equal to 3,4 and 5 in an element with atomic number (z) 24 are respectively (n principal quantum number 14 May, 2023 (M)Quantum mechanical model
  24. 24Match the following (A) (B) (C) (D) (I) 0 (II) (III) (IV) (V) The correct answer is:14 May, 2023 (M)Quantum mechanical model
  25. 25A 100 watt bulb emits light of wavelength ' ' . What is the value of , if the number of photons emitted is ? watt14 May, 2023 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  26. 26The ratio of the difference in energy between the first and second Bohr orbits to that between the second and third orbits is14 May, 2023 (E)Bohr's model
  27. 27Assertion (A): First ionisation enthalpy of oxygen is less than that of nitrogen Reason (R): Atoms with half-filled or completely filled orb14 May, 2023 (E)Electronic configuration
  28. 28The radius of first Bohr orbit of hydrogen atom is same as that of orbit (n) of hydrogen like species X. (n) and X respectively are13 May, 2023 (M)Bohr's model
  29. 29Identify the impossible quantum number set for the electron from the following13 May, 2023 (M)Quantum mechanical model
  30. 30What is the approximate angular momentum (in ) of electron in hydrogen atom in its ground state?13 May, 2023 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  31. 31The energy of electron in hydrogen atom when present in and will be in the ratio of13 May, 2023 (E)Bohr's model
  32. 32Observe the following ions How many ions in the above list have zero magnetic moment?13 May, 2023 (E)Quantum mechanical model
  33. 33The radius of third orbit of hydrogen atom is . The radius of second orbit of ion (in pm is)12 May, 2023 (M)Bohr's model
  34. 34The threshold frequency of a metal is . The ratio of maximum kinetic energies of the photoelectrons, when the metal is made to strike with r12 May, 2023 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  35. 35The wavelength of second line of Balmer series of hydrogen atom is . What is the wavelength of first line of Lyman series of ion (in )?12 May, 2023 (E)Hydrogen spectrum
  36. 36Consider the following: I. The electron spin quantum number describes the orientation of the spin of the nucleus with respect to the magneti12 May, 2023 (E)Quantum mechanical model
  37. 37The maximum number of orbitals present in energy level of an atom and the maximum number of electrons with spin value in the same orbitals a20 Jul, 2022 (M)Quantum mechanical model
  38. 38The approximate ratio of the speed of light in vacuum to that of an electron in the first Bohr orbit of hydrogen atom is20 Jul, 2022 (M)Bohr's model
  39. 39Which of the following species are isoelectronic species? (i) (ii) (iii) (iv)20 Jul, 2022 (M)Atomic Mass and Atomic Size
  40. 40Choose the correct statements in reference to the photoelectric effect. (i) There is no time lag between the striking of light and ejection 20 Jul, 2022 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  41. 41Assertion : Mo has the ground state electronic configuration . Reason : Mo has the highest exchange energy among the second row transition e20 Jul, 2022 (E)Electronic configuration
  42. 42If the uncertainty in velocity is , then the ratio of uncertainty in position and momentum is19 Jul, 2022 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  43. 43The valency shell electronic configuration of and atoms, respectively, are19 Jul, 2022 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  44. 44If the radius and energy of the second Bohr orbit of hydrogen atom is and , respectively. The radius and energy of the third Bohr orbit will19 Jul, 2022 (E)Bohr's model
  45. 45When a radiation of is shined on five metals, namely, and , the number of metals that show photoelectric effect are19 Jul, 2022 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  46. 46The increase in the atomic radii of the third (5d) series of transition elements is very small, which may be accounted for the filling of ' 19 Jul, 2022 (E)Electronic configuration
  47. 47In hydrogen atom, the minimum energy required to excite an electron from 2 nd orbit to the 3 rd orbit is18 Jul, 2022 (M)Hydrogen spectrum
  48. 48The velocity V of de Broglie wave is given by u = Frequency m = mass C = Velocity of light18 Jul, 2022 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  49. 49The total number of spectral lines observed when electron returns from the 6 th shell until the 2 nd shell in hydrogen atom is18 Jul, 2022 (E)Hydrogen spectrum
  50. 50The orbital angular momentum of an electron in d orbital is equal to18 Jul, 2022 (E)Quantum mechanical model

Frequently Asked Questions

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

This chapter includes 147 questions compiled from TS EAMCET papers spanning 2001 to 2025.

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

These are TS 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 TS EAMCET Chemistry?

Structure of Atom has appeared in 25 of the 25 years of TS EAMCET papers covered here, with 147 questions across 64 papers - about 2 per paper it appears in.

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

Of the 147 questions analysed for this chapter, 57% are easy, 41% moderate and 1% tough. 2020 had the most, with 18 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 - 38 questions (26%)
  • Quantum mechanical model - 30 questions (20%)
  • Bohr's model - 26 questions (18%)
  • Bohr's model has produced the most tough questions (1).
6.Is Structure of Atom's weightage in TS EAMCET going up or down?

Across all 64 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 2.2 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.