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Friday, 9 October

JEE Main Chemistry · Class 11

Structure of Atom: JEE Main previous year questions

Structure of Atom had 46 questions in the 42 JEE Main shifts Lumi analysed, about 1.0 a shift, asked in 40 of 42 shifts. It ranks 15 of 30 Chemistry chapters by questions; 0% of its questions were hard.

Questions
46
in 40 of 42 shifts
A shift, on average
1.0
of 25 Chemistry questions
Since 2024
+0.1
1.0 a shift in 2017–23, 1.1 in 2024–26
Numerical answer
14
30% of its questions

Year by year

How often it came

Questions in the analysed shifts of each year. Years differ in how many shifts Lumi analysed, so read the bars with the shift count.

Questions each year
06122’172’204’214’225’238’249’2512’26

2017: 1 shifts · 2020: 4 shifts · 2021: 4 shifts · 2022: 4 shifts · 2023: 4 shifts · 2024: 8 shifts · 2025: 8 shifts · 2026: 9 shifts

Difficulty by year
  • 20172
  • 20202
  • 20214
  • 20224
  • 20235
  • 20248
  • 20259
  • 202612
  • Easy
  • Medium
  • Hard

Inside the chapter

Topics and the ideas that repeat

4 topics and 20 distinct ideas; 10 ideas were asked more than once. Most questions are single correct and calculation.

Topics, by questions

8 questions had no close topic in our taxonomy and are counted for the chapter only.

Ideas asked most
10 repeat

Study it on Lumi

Structure of Atom: the interactive lesson

Every question

All 46 Structure of Atom questions

Newest first. Each opens with its options and the official answer.

2026 12 questions

  1. 2 Apr 2026, Shift 1 · Q52What is the energy (in J atom−1\mathrm{J\ atom^{-1}}) required for the following process ? Li2+(g)→Li3+(g)+e−\mathrm{Li^{2+}(g)\rightarrow Li^{3+}(g)+e^-} (Take…EasySingle correct
  2. 2 Apr 2026, Shift 2 · Q71The surface of sodium metal is irradiated with radiation of wavelength xx nm. The kinetic energy of ejected electrons is…EasyNumerical value
  3. 4 Apr 2026, Shift 1 · Q52What is the ratio of wave number of first line (lowest energy line) of Balmer series of H atomic spectrum to first line of its Brackett…MediumSingle correct
  4. 4 Apr 2026, Shift 1 · Q53Which of the following is correct set of 44 quantum numbers of 19th19^{\text{th}} electron in Chromium (Atomic number =24=24) in accordance…MediumSingle correct
  5. 4 Apr 2026, Shift 2 · Q52The species having identical radii according to the Bohr's theory are: A. H (first orbit) B. He+\mathrm{He^+} (first orbit) C.…EasyOther
  6. 5 Apr 2026, Shift 1 · Q52Arrange the following atomic orbitals of multi electron atoms in order of increasing energy. A. n=3,l=2,m=+1n = 3, l = 2, m = +1 B.…MediumOther
  7. 5 Apr 2026, Shift 1 · Q53Identify the correct statements from the following : A. Heisenberg uncertainty principle is applicable to electrons. B. The size of 2px2p_x…EasyOther
  8. 5 Apr 2026, Shift 2 · Q52Which of the following statement(s) is/are true ? A. If two orbitals have the same value of (n+l)(n+l), the orbital with lower value of n…MediumOther
  9. 6 Apr 2026, Shift 1 · Q52If shortest wavelength of hydrogen atom in Lyman series is xx, then longest wavelength in Balmer series of He+\mathrm{He^+} is:MediumSingle correct
  10. 6 Apr 2026, Shift 1 · Q53Match the LIST-I with LIST-II List-I (Orbital) | List-II (Radial nodes and nodal plane) A. 2s | I. 1 Radial node + two nodal planes B. 3s…MediumMatch the list
  11. 6 Apr 2026, Shift 2 · Q52The Bohr radius of a hydrogen like species is 70.53 pm. The species and the stationary state (nn) are respectively (Given : Hydrogen atom…EasySingle correct
  12. 8 Apr 2026, Shift 2 · Q73Consider two radiations of wavelengths 1. λ1=2000\lambda_1 = 2000 Å 2. λ2=6000\lambda_2 = 6000 Å The ratio of the energies of these two radiations…EasyNumerical value

2025 9 questions

  1. 2 Apr 2025, Shift 1 · Q52According to Bohr's model of hydrogen atom, which of the following statement is incorrect ?EasySingle correct
  2. 2 Apr 2025, Shift 2 · Q52Which of the following statements are true ? (A) The subsidiary quantum number ll describes the shape of the orbital occupied by the…MediumOtherHas a figure
  3. 3 Apr 2025, Shift 1 · Q52Which of the following postulate of Bohr's model of hydrogen atom is not in agreement with quantum mechanical model of an atom?EasySingle correct
  4. 3 Apr 2025, Shift 2 · Q52For electrons in '2s' and '2p' orbitals, the orbital angular momentum values, respectively are :EasySingle correct
  5. 4 Apr 2025, Shift 2 · Q51Consider the ground state of chromium atom (Z=24)(Z=24). How many electrons are with Azimuthal quantum number l=1l=1 and l=2l=2 respectively ?EasySingle correct
  6. 7 Apr 2025, Shift 1 · Q52Which of the following statements are correct, if the threshold frequency of caesium is 5.16×10145.16 \times 10^{14} Hz? A. When Cs is placed…MediumOtherHas a figure
  7. 7 Apr 2025, Shift 2 · Q51The extra stability of half-filled subshell is due to : (A) Symmetrical distribution of electrons (B) Smaller coulombic repulsion energy…MediumOther
  8. 8 Apr 2025, Shift 2 · Q51Correct statements for an element with atomic number 9 are A. There can be 5 electrons for which ms=+12m_s = +\frac{1}{2} and 4 electrons for…MediumOther
  9. 8 Apr 2025, Shift 2 · Q72The energy of an electron in first Bohr orbit of H-atom is −13.6 eV. The magnitude of energy value of electron in the first excited state…EasyNumerical value

2024 8 questions

  1. 6 Apr 2024, Shift 2 · Q81For hydrogen atom, energy of an electron in first excited state is −3.4-3.4 eV, K.E. of the same electron of hydrogen atom is xx eV. Value…EasyNumerical value
  2. 8 Apr 2024, Shift 1 · Q81A hypothetical electromagnetic wave is show below. [figure: sinusoidal wave along an axis with a distance marked 1.5 pm between two dashed…EasyNumerical valueHas a figure
  3. 9 Apr 2024, Shift 1 · Q61Compare the energies of following sets of quantum numbers for multielectron system. (A) n=4,l=1n=4, l=1 (B) n=4,l=2n=4, l=2 (C) n=3,l=1n=3, l=1 (D)…EasySingle correct
  4. 9 Apr 2024, Shift 2 · Q81Based on Heisenberg's uncertainty principle, the uncertainty in the velocity of the electron to be found within an atomic nucleus of…EasyNumerical value
  5. 29 Jan 2024, Shift 1 · Q61The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is :EasySingle correct
  6. 30 Jan 2024, Shift 2 · Q81Number of spectral lines obtained in He+\mathrm{He^+} spectra, when an electron makes transition from fifth excited state to first excited…EasyNumerical value
  7. 31 Jan 2024, Shift 1 · Q82The ionization energy of sodium in kJ mol−1^{-1}, if electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium…MediumNumerical value
  8. 31 Jan 2024, Shift 2 · Q62The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) areEasySingle correct

2023 5 questions

  1. 6 Apr 2023, Shift 1 · Q82The wavelength of an electron of kinetic energy 4.50×10−294.50\times10^{-29} J is ________ ×10−5\times10^{-5} m. (Nearest integer) Given : mass of…EasyNumerical value
  2. 8 Apr 2023, Shift 2 · Q64Henry Moseley studied characteristic X-ray spectra of elements. The graph which represents his observation correctly is Given ν\nu =…EasyDiagram basedHas a figure
  3. 8 Apr 2023, Shift 2 · Q81The number of atomic orbitals from the following having 5 radial nodes is ____________. 7s, 7p, 6s, 8p, 8dEasyNumerical value
  4. 11 Apr 2023, Shift 1 · Q61Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : In the photoelectric…MediumAssertion–reason
  5. 13 Apr 2023, Shift 2 · Q83The orbital angular momentum of an electron in 3s orbital is xh2π\frac{xh}{2\pi}. The value of xx is ______ (nearest integer)EasyNumerical value

2022 4 questions

  1. 25 Jul 2022, Shift 1 · Q62Which of the following sets of quantum numbers is not allowed ?EasySingle correct
  2. 28 Jul 2022, Shift 1 · Q61Identify the incorrect statement from the following.MediumSingle correct
  3. 24 Jun 2022, Shift 1 · Q62Consider the following pairs of electrons (A) (a) n=3,l=1,ml=1,ms=+12n=3, l=1, m_l=1, m_s=+\frac{1}{2} (b) n=3,l=2,ml=1,ms=+12n=3, l=2, m_l=1, m_s=+\frac{1}{2} (B) (a)…EasyOther
  4. 29 Jun 2022, Shift 1 · Q62Which of the following statements are correct ? (A) The electronic configuration of Cr is [Ar] 3d5 4s13d^5\,4s^1. (B) The magnetic quantum…EasyOther

2021 4 questions

  1. 3 Aug 2021, Shift 2 · Q53The ratio of radii for the first and third orbits of hydrogen atom is 1:x1 : x. The value of xx is ‾\underline{\hspace{2em}}. (Integer…EasyNumerical value
  2. 25 Jul 2021, Shift 1 · Q53A source of monochromatic radiation of wavelength 400 nm provides 1000 J of energy in 10 seconds. When this radiation falls on the surface…MediumNumerical value
  3. 16 Mar 2021, Shift 2 · Q53The number of orbitals with n=5n=5, ml=+2m_l=+2 is ________. (Round off to the Nearest Integer).EasyNumerical value
  4. 18 Mar 2021, Shift 1 · Q32A certain orbital has no angular nodes and two radial nodes. The orbital is :EasySingle correct

2020 2 questions

  1. 8 Jan 2020, Shift 1 · Q30For the Balmer series in the spectrum of H atom, νˉ=RH{1n12−1n22}\bar{\nu} = R_H\left\{\frac{1}{n_1^2}-\frac{1}{n_2^2}\right\}, the correct statements…MediumOther
  2. 2 Sep 2020, Shift 1 · Q30The figure that is not a direct manifestation of the quantum nature of atoms is :MediumDiagram basedHas a figure

2017 2 questions

  1. 2 Apr 2017 (offline) · Q38The radius of the second Bohr orbit for hydrogen atom is : (Planck's Const. h=6.6262×10−34h=6.6262\times10^{-34} Js; mass of electron…EasySingle correct
  2. 2 Apr 2017 (offline) · Q49The most abundant elements by mass in the body of a healthy human adult are : Oxygen (61.4%); Carbon (22.9%), Hydrogen (10.0%); and…MediumSingle correct

Pattern: Asked most years.