Jump to a section

Chemistry - Structure of Atom

Practise 34 KCET previous year questions on Structure of Atom, compiled from papers spanning 2007 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 KCET tests.

Structure of Atom has been asked in 20 of the 20 years of KCET papers analysed (2007–2026), with 34 questions in all. 68% of them were easy, 29% moderate and 3% tough. Most of its questions came from 2009, with 4 questions that year. In the last three years (2024–2026) it had 5 questions across 3 papers, about 1.7 per paper.

The chapter's 6 topics are not weighted equally: Quantum mechanical model (15 questions, 44%), Dual Behaviour of Matter and Heisenberg Uncertainty Principle (8 questions, 24%), and Atomic Mass and Atomic Size (5 questions, 15%) have been asked the most. Over the last five years the most frequent topics have been Dual Behaviour of Matter and Heisenberg Uncertainty Principle (3), Atomic Mass and Atomic Size (2), and Quantum mechanical model (2). Quantum mechanical model has produced the most tough questions (1).

  1. 1Which of the following represents de Broglie equation?2026Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  2. 2Which of the following is the CORRECT statement about ?2026Quantum mechanical model
  3. 3The number of orbitals associated with ' N ' shell of an atom is2025Quantum mechanical model
  4. 4According to the Heisenberg's Uncertainty principle, the value of for an object whose mass is is2025Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  5. 5The energy associated with first orbit of is2024Bohr's model
  6. 6The number of protons, neutrons and electrons in the ion respectively are2023Atomic Mass and Atomic Size
  7. 7If wavelength of photon is and , then momentum of photon2022Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  8. 8Elements and have atomic numbers 19,37 and 55 respectively. Which of the following statements is true about them ?2022Atomic Mass and Atomic Size
  9. 9The number of angular and radial nodes in orbital respectively are2021Quantum mechanical model
  10. 10With regard to photoelectric effect, identify the correct statement among the following.2020Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  11. 11The last element of the -block in 6th period is represented by the outer most electronic configuration.2020Electronic configuration
  12. 12Two particles \(A\) and \(B\) are in motion. If the wavelength associated with particle \(A\) is \(5 10^{-8} {~m}\). Calculated the waveleng2019Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  13. 13The orbital nearest to the nucleus is2018Electronic configuration
  14. 14Which of the following statement is wrong regarding lanthanoids?2017Quantum mechanical model
  15. 15The energy of electron in the \( n^{ {th }} \) Bohr orbit of H-atom is2016Bohr's model
  16. 16Consider the following sets of quantum numbers. Which of the below setting is not permissible arrangement of electrons in an atom?2016Quantum mechanical model
  17. 17The two electrons have the following set of quantum numbers : \[ {array}{l} P=3,2,-2,+ {1}{2} \\ Q=3,0,0,+ {1}{2} {array} \] Which of the fo2015Quantum mechanical model
  18. 18Preview not available - open to view this question.2014Quantum mechanical model
  19. 19In which one of the pairs of ion given, there is an ion that forms a co-ordination compound with both aqueous sodium hydroxide and ammonia a2014Electronic configuration
  20. 20Which one of the following sets of ions represents the collection of isoelectronic species?2013Atomic Mass and Atomic Size
  21. 21Impossible orbital among the following is2012Quantum mechanical model
  22. 22The correct set of four quantum numbers for the outermost electron of sodium is2012Quantum mechanical model
  23. 23Which one of the following sets of quantum numbers represents the highest energy level in an atom?2011Quantum mechanical model
  24. 24If the energies of the two photons in the ratio of , their wavelength will be in the ratio of2011Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  25. 25The wave number of the spectral line in the emission spectrum of hydrogen will be equal to times the Rydberg's constant if the electron jump2010Hydrogen spectrum
  26. 26The set of quantum numbers for the outermost electron for copper in its ground state is2010Quantum mechanical model
  27. 27The spin only magnetic moment of ion is nearly2010Quantum mechanical model
  28. 28A solution of urea is isotonic with2009Atomic Mass and Atomic Size
  29. 29The correct set of four quantum numbers for outermost electron of potassium is2009Quantum mechanical model
  30. 30A body of mass is moving with a velocity of . Its de-Broglie wavelength is . Hence, is )2009Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  31. 31The magnetic moment of a transition metal ion is BM. Therefore, the number of unpaired electrons present in it, is2009Quantum mechanical model
  32. 32When the azimuthal quantum number has the value of 2 , the number of orbitals possible are2008Quantum mechanical model
  33. 33A body of mass is moving with a velocity of . The wavelength of de-Broglie wave associated with it would be ( )2007Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  34. 34is isoelectronic with2007Atomic Mass and Atomic Size

Frequently Asked Questions

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

This chapter includes 34 questions compiled from KCET papers spanning 2007 to 2026.

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

These are KCET 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 KCET Chemistry?

Structure of Atom has appeared in 20 of the 20 years of KCET papers covered here, with 34 questions across 20 papers - about 2 per paper it appears in.

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

Of the 34 questions analysed for this chapter, 68% are easy, 29% moderate and 3% tough. 2009 had the most, with 4 questions.

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

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

  • Quantum mechanical model - 15 questions (44%)
  • Dual Behaviour of Matter and Heisenberg Uncertainty Principle - 8 questions (24%)
  • Atomic Mass and Atomic Size - 5 questions (15%)
  • Quantum mechanical model has produced the most tough questions (1).
6.Is Structure of Atom's weightage in KCET going up or down?

Across all 20 papers analysed, Structure of Atom has averaged about 1.7 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.