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Chemistry - Structure of Atom

Practise 124 MHTCET previous year questions on Structure of Atom, compiled from papers spanning 2008 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty MHTCET tests.

Structure of Atom has been asked in 12 of the 17 years of MHTCET papers analysed (2007–2026), with 124 questions in all. 73% of them were easy, 23% moderate and 4% tough. Most of its questions came from 2024, with 29 questions that year. In the last three years (2024–2026) it had 62 questions across 59 papers, about 1.1 per paper.

The chapter's 7 topics are not weighted equally: Bohr's model (27 questions, 22%), Quantum mechanical model (24 questions, 19%), and Hydrogen spectrum (22 questions, 18%) have been asked the most. Bohr's model has also led over the last five years, with 25 questions. Bohr's model has produced the most tough questions (1).

  1. 1Identify pair of orbitals having similar values from the following.20 Apr, 2026 (E)Quantum mechanical model
  2. 2What is the wave number of lowest transition associated with Paschen series?19 Apr, 2026 (M)Hydrogen spectrum
  3. 3Calculate the shortest wavelength in hydrogen spectrum emission of Lymen series ( )19 Apr, 2026 (E)Hydrogen spectrum
  4. 4Which of the following colours of visible light has lowest energy?18 Apr, 2026 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  5. 5Which from following colours has highest energy if wave lengths of violet, blue, yellow and red light are 410 nm, 470 nm, 580 nm and 750 nm 18 Apr, 2026 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  6. 6What is uncertainty in velocity of an electron if uncertainty in measurement of position is 50 pm ?17 Apr, 2026 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  7. 7Find the energy of third stationary orbit of Bohr's model of hydrogen atom if the energy of ground state is J17 Apr, 2026 (E)Bohr's model
  8. 8What is the energy of an electron in a hydrogen atom in a stationary state corresponding to n = 2 ?16 Apr, 2026 (M)Bohr's model
  9. 9What is the observed electronic configuration of Cu ?16 Apr, 2026 (M)Electronic configuration
  10. 10What is the number of unpaired electrons present in ground state of Silicon and Chromium, respectively ?16 Apr, 2026 (E)Electronic configuration
  11. 11Calculate the de Broglie wavelength of an electron in the first Bohr orbit of a hydrogen atom if the velocity of an electron in the first or15 Apr, 2026 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  12. 12If the velocity of the electron in Bohr's first orbit is , Calculate the de Broglie wavelength associated with it. Mass of electrons kg15 Apr, 2026 (E)Bohr's model
  13. 13Which of the following pairs represents isobars?13 Apr, 2026 (M)Atomic Mass and Atomic Size
  14. 14The electronic configurations of elements are as- Which of the following is formula of ionic compound that could be formed between these two13 Apr, 2026 (M)Electronic configuration
  15. 15What is the atomic number of an element having electronic configuration and belonging to 3d transition series?13 Apr, 2026 (M)Electronic configuration
  16. 16If the energy of an electron in the first Bohr orbit of the H-atom is J then the energy of the electron in the second orbit will be13 Apr, 2026 (E)Bohr's model
  17. 17Match List I with List II List I Element List II Number of Neutron (A). (I). (B). (II). (C). (III). (D). (IV). Choose the correct answer fro11 Apr, 2026 (M)Atomic Mass and Atomic Size
  18. 18What are the total number of electrons present in s and p orbitals respectively in the argon?11 Apr, 2026 (E)Electronic configuration
  19. 19Calculate the frequency in of orange colour light having wave length05 May, 2025 (E)Hydrogen spectrum
  20. 20Calculate velocity of an electron having de Broglie's wavelength 58 nm and mass27 Apr, 2025 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  21. 21" It is impossible to determine simultaneously the exact position and exact momentum of an electron. " This statement is called26 Apr, 2025 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  22. 22"Pairing of electrons in the orbitals belonging to the same subshell does not occur unless each orbital belonging to that subshell has got o26 Apr, 2025 (E)Electronic configuration
  23. 23Which from following d-orbitals has different shape as compared with others?25 Apr, 2025 (M)Quantum mechanical model
  24. 24Which of the following elements contains maximum number of unpaired electrons?25 Apr, 2025 (E)Electronic configuration
  25. 25What is the numerical value of angular momentum for an electron in first orbit of hydrogen atom ? ( )23 Apr, 2025 (M)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  26. 26What is the number of node in 2 s orbital?23 Apr, 2025 (E)Quantum mechanical model
  27. 27Which from following is NOT hydrogen like species?22 Apr, 2025 (M)Bohr's model
  28. 28Calculate the energy per mole of photon of electromagnetic radiation having wave length 700 nm21 Apr, 2025 (M)Hydrogen spectrum
  29. 29Which from following statements is NOT true about isotopes?21 Apr, 2025 (E)Atomic Mass and Atomic Size
  30. 30Calculate the energy associated with third orbit of .20 Apr, 2025 (M)Bohr's model
  31. 31No two electrons in an atom can have the identical set of four quantum numbers." The statement is known as20 Apr, 2025 (E)Electronic configuration
  32. 32Calculate the longest wavelength in hydrogen emission spectrum of Lymen series19 Apr, 2025 (M)Hydrogen spectrum
  33. 33What is the wavenumber of the photon emitted during transition from the orbit to that of in hydrogen atom?19 Apr, 2025 (E)Hydrogen spectrum
  34. 34What is wavenumber of a radiation having wavelength ?16 May, 2024 (M)Hydrogen spectrum
  35. 35Which of the following species contain 20 electrons?16 May, 2024 (M)Atomic Mass and Atomic Size
  36. 36What is de Broglie's wavelength for a particle having mass moving with velocity of16 May, 2024 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  37. 37Which of the following series of emission spectral lines for hydrogen observed in visible region?16 May, 2024 (E)Hydrogen spectrum
  38. 38Calculate the radius of first orbit of .15 May, 2024 (M)Bohr's model
  39. 39What is the total number of orbitals present in N shell?15 May, 2024 (M)Quantum mechanical model
  40. 40Calculate the radius of first orbit of .15 May, 2024 (E)Bohr's model
  41. 41What is the designation of an orbital with quantum numbers and ?15 May, 2024 (E)Quantum mechanical model
  42. 42Which of the following equations gives angular momentum of an electron in a stationary orbit?11 May, 2024 (M)Bohr's model
  43. 43What is the wave number of lowest transition associated with Lyman series?11 May, 2024 (M)Hydrogen spectrum
  44. 44Which from following statements is NOT correct regarding Bohr model?11 May, 2024 (E)Bohr's model
  45. 45Which of the following is radius of first orbit of ?10 May, 2024 (M)Bohr's model
  46. 46Which of the following orbitals is represented by and ?10 May, 2024 (E)Quantum mechanical model
  47. 47What is the frequency of violet light having wavelength 400 nm ?10 May, 2024 (E)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  48. 48Which of the following rules states that it is impossible to determine simultaneously the exact position and exact momentum of an electron?09 May, 2024 (M)Electronic configuration
  49. 49What is the number of electrons present in d-subshell if its atomic number is 27 and oxidation state is +2 ?09 May, 2024 (M)Electronic configuration
  50. 50Which from following pairs is an example of isotones?09 May, 2024 (M)Atomic Mass and Atomic Size

Frequently Asked Questions

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

This chapter includes 124 questions compiled from MHTCET papers spanning 2008 to 2026.

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

These are MHTCET 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 MHTCET Chemistry?

Structure of Atom has appeared in 12 of the 17 years of MHTCET papers covered here, with 124 questions across 83 papers - about one per paper it appears in.

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

Of the 124 questions analysed for this chapter, 73% are easy, 23% moderate and 4% tough. 2024 had the most, with 29 questions.

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

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

  • Bohr's model - 27 questions (22%)
  • Quantum mechanical model - 24 questions (19%)
  • Hydrogen spectrum - 22 questions (18%)
  • Bohr's model has produced the most tough questions (1).
6.Is Structure of Atom's weightage in MHTCET going up or down?

Across all 83 papers analysed, Structure of Atom has averaged about 1.5 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.1 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.