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Chemistry - Structure of Atom

Practise 54 AIIMS previous year questions on Structure of Atom, compiled from papers spanning 2001 to 2019. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AIIMS tests.

Structure of Atom has been asked in 18 of the 19 years of AIIMS papers analysed (2001–2019), with 54 questions in all. 65% of them were easy, 26% moderate and 9% tough. Most of its questions came from 2002, with 7 questions that year. In the last three years (2017–2019) it had 12 questions across 5 papers, about 2.4 per paper.

The chapter's 7 topics are not weighted equally: Quantum mechanical model (11 questions, 20%), Atomic Mass and Atomic Size (11 questions, 20%), and Hydrogen spectrum (9 questions, 17%) have been asked the most. Atomic Mass and Atomic Size has produced the most tough questions (2).

  1. 1A bulb is emitted electromagnetic radiation of wavelength. The total energy of radiation is . The number of emitted photons will be26 May, 2019Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  2. 2If for ion then find out the wave length.25 May, 2019Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  3. 3Assertion : The chemical properties of different isotopes are same. Reason: Isotopes have same number of neutrons.25 May, 2019Atomic Mass and Atomic Size
  4. 4Assertion : The free gaseous atom has six unpaired electrons. Reason : Half-filled -orbital has greater stability.25 May, 2019Electronic configuration
  5. 5What is the maximum wavelength of line of Balmer series of hydrogen spectrum?27 May, 2018Hydrogen spectrum
  6. 6In the and ions, the increasing order of size is27 May, 2018Atomic Mass and Atomic Size
  7. 7Wavelength of a particular transition for atom is . What can be the wavelength of for the same transition?27 May, 2018Hydrogen spectrum
  8. 8Assertion : Fine lines are observed in spectra if an atom is placed in a magnetic field. Reason : Degenerate orbitals split in the presence 27 May, 2018Hydrogen spectrum
  9. 9Calculate the velocity of an electron placed in the second orbit of ion.26 May, 2018Bohr's model
  10. 10The position of both an electron and helium atom is known within . The momentum of the electron is known within . The minimum uncertainty in26 May, 2018Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  11. 11The molecule is trigonal bipyramidal. The hybrid orbitals used by the As atoms for bonding are2017Quantum mechanical model
  12. 12Ionisation potential of hydrogen atom is . Hydrogen atom in ground state is excited by monochromatic light of energy . The spectral lines em2017Hydrogen spectrum
  13. 13According to Bohr's theory, which of the following correctly represents the variation of energy and radius of an electron in orbit of -atom?2016Bohr's model
  14. 14Assertion : For hydrogen like species, energy of an electron in a particular orbit increases with increase in value of . Reason : Electroneg2016Bohr's model
  15. 15-Particles can be detected by using2015Atomic Models
  16. 16Which of the following arrangement is possible?2015Quantum mechanical model
  17. 17Assertion : For Balmer series of hydrogen spectrum, the value and . Reason : The value of for a line in Balmer series of hydrogen spectrum h2015Hydrogen spectrum
  18. 18Choose the correctly paired gaseous cation and its magnetic (spin only) moment (in B.M.)2014Quantum mechanical model
  19. 19Which of the following pairs represent isotones?2014Atomic Mass and Atomic Size
  20. 20Assertion: is known but is not. Reason : has electronic configuration.2014Electronic configuration
  21. 21A particle is moving 3 times faster than the speed of electron. If the ratio of wavelength of particle and electron is , then particle is2013Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  22. 22Assertion : Number of radial and angular nodes for -orbital are 1,1 respectively. Reason : Number of radial and angular nodes depends only o2013Quantum mechanical model
  23. 23Threshold frequency of a metal is upon which frequency light is focused. Then the maximum kinetic energy of emitted electron is2012Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  24. 24In Bohr's orbit, indicates2012Bohr's model
  25. 25Assertion : Bohr model fails in case of multielectron species. Reason : It does not mention electron-electron interactions.2012Bohr's model
  26. 26Assertion : The spectrum of is expected to be similar to that of hydrogen. Reason : is also one electron system.2012Hydrogen spectrum
  27. 27Smallest wavelength occurs for2011Hydrogen spectrum
  28. 28Which of the following is wrong for Bohr model?2011Bohr's model
  29. 29Assume that you are travelling at a speed of in a small car with a mass of . If the uncertainty in the velocity of the car is , what is the 2010Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  30. 30Assertion : The nuclear isomers are the atoms with the same atomic number and same mass number, but with different radioactive properties. R2010Atomic Mass and Atomic Size
  31. 31Assertion : S.I. unit of atomic mass and molecular mass is kilograms. Reason : Atomic mass is equal to the mass of atoms.2010Atomic Mass and Atomic Size
  32. 32Assertion : The quantized energy of an electron is largely determined by its principal quantum number. Reason : The principal quantum number2008Quantum mechanical model
  33. 33Which of the following radioisotopes is used as anticancerous?2007Atomic Mass and Atomic Size
  34. 34The compound used in enrichment of uranium for nuclear power plant is2006Atomic Mass and Atomic Size
  35. 35The de Broglie wavelength associated with a ball of mass having kinetic energy is2006Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  36. 36emits -particles and -particles. The neutron/proton ratio in the product nucleus is2005Atomic Mass and Atomic Size
  37. 37The isoelectronic pair is2005Atomic Mass and Atomic Size
  38. 38-Particles can be detected using2005Atomic Models
  39. 39The most probable radius (in pm) for finding the electron in is2005Bohr's model
  40. 40For principle quantum number , the total number of orbitals having is2004Quantum mechanical model
  41. 41Assertion : The free gaseous atom has six unpaired electrons. Reason : Half-filled orbital has greater stability.2004Electronic configuration
  42. 42Assertion : Nuclear binding energy per nucleon is in the order . Reason : Binding energy per nucleon increases linearly with difference in n2004Quantum mechanical model
  43. 43The quantum number of a free gas eous atom is associated with2003Quantum mechanical model
  44. 44Assertion : emits a positron giving . Reason : In emission neutron is transformed into proton.2003Atomic Mass and Atomic Size
  45. 45Quantum numbers of an atom can be defined on the basis of2002Quantum mechanical model
  46. 46Which of the following has maximum energy?2002Electronic configuration
  47. 47Spectrum of is similar to that of2002Hydrogen spectrum
  48. 48Azimuthal quantum number defines2002Quantum mechanical model
  49. 49Which of the following does not have valence electron in -subshell?2002Electronic configuration
  50. 50Assertion : For Balmer series of hydrogen spectrum, the value and . Reason: The value of for a line in Balmer series of hydrogen spectrum ha2002Bohr's model

Frequently Asked Questions

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

This chapter includes 54 questions compiled from AIIMS papers spanning 2001 to 2019.

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

These are AIIMS questions specifically for the Structure of Atom chapter. Questions from other exams like NEET or JIPMER are organised separately under their respective exam sections.

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

Structure of Atom has appeared in 18 of the 19 years of AIIMS papers covered here, with 54 questions across 20 papers - about 3 per paper it appears in.

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

Of the 54 questions analysed for this chapter, 65% are easy, 26% moderate and 9% tough. 2002 had the most, with 7 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 - 11 questions (20%)
  • Atomic Mass and Atomic Size - 11 questions (20%)
  • Hydrogen spectrum - 9 questions (17%)
  • Atomic Mass and Atomic Size has produced the most tough questions (2).
6.Is Structure of Atom's weightage in AIIMS going up or down?

Across all 20 papers analysed, Structure of Atom has averaged about 2.7 questions per paper. In the last three years (2017–2019), that average has stayed about the same, at about 2.4 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.