JEE Main Chemistry · Structure of Atom

Quantum Numbers in JEE Main

Name: Quantum Numbers: JEE Main previous year questions
Creator: Lumi

Quantum Numbers (Chemistry, Structure of Atom) came 23 times in 22 of the 42 JEE Main shifts Lumi analysed, across 13 distinct ideas. 14 of them came in 2024–26; it was last asked in 2026.

Questions: 23; in 22 shifts
Ideas asked: 13; 6 asked more than once
Numerical answer: 3; 13% of its questions
Pattern: Asked most years; last asked 2026

Questions each year

In the shifts Lumi analysed for each year.

Difficulty and format

Easy 15Medium 8Hard 0

Format

Single correct10 Q
Other9 Q
Numerical value3 Q
Match the list1 Q

Ideas inside the topic

13 ideas

Aufbau Principle and n+l Rule4 Q
Anomalous Electron Configurations3 Q
Calculation of Radial and Angular Nodes3 Q
Orbital and Spin Angular Momentum2 Q
Magnetic Quantum Number2 Q
Quantum Numbers of the Differentiating Electron2 Q
Calculation of Exchange Energy Pairs1 Q
Hydrogen vs Multi-Electron Degeneracy1 Q
Configurations of Isoelectronic Species1 Q
Spin Quantum Number1 Q
Orbital Boundary Surface Diagrams1 Q
Counting Unpaired Electrons1 Q

Where it sits

Part of Structure of Atom, which had 46 questions in all. Quantum Numbers accounts for 50% of them. In Lumi's JEE taxonomy it belongs to Physical Chemistry.

Some questions sit in other chapters too: Classification of Elements and Periodicity in Properties.

Every question

All 23 Quantum Numbers questions

Newest first, each with its options and official answer.

4 Apr 2026, Shift 1 · Q53Which of the following is correct set of $4$ quantum numbers of $19^{\text{th}}$ electron in Chromium (Atomic number $=24$ ) in accordance…MediumSingle correct
5 Apr 2026, Shift 1 · Q52Arrange the following atomic orbitals of multi electron atoms in order of increasing energy. A. $n = 3, l = 2, m = +1$ B.…MediumOther
5 Apr 2026, Shift 1 · Q53Identify the correct statements from the following : A. Heisenberg uncertainty principle is applicable to electrons. B. The size of $2p_x$ …EasyOther
5 Apr 2026, Shift 2 · Q52Which of the following statement(s) is/are true ? A. If two orbitals have the same value of $(n+l)$ , the orbital with lower value of n…MediumOther
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
2 Apr 2025, Shift 2 · Q52Which of the following statements are true ? (A) The subsidiary quantum number $l$ describes the shape of the orbital occupied by the…MediumOtherHas a figure
3 Apr 2025, Shift 2 · Q52For electrons in '2s' and '2p' orbitals, the orbital angular momentum values, respectively are :EasySingle correct
4 Apr 2025, Shift 2 · Q51Consider the ground state of chromium atom $(Z=24)$ . How many electrons are with Azimuthal quantum number $l=1$ and $l=2$ respectively ?EasySingle correct
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 Apr 2025, Shift 2 · Q51Correct statements for an element with atomic number 9 are A. There can be 5 electrons for which $m_s = +\frac{1}{2}$ and 4 electrons for…MediumOther
6 Apr 2024, Shift 2 · Q69Arrange the following elements in the increasing order of number of unpaired electrons in it. (A) Sc (B) Cr (C) V (D) Ti (E) Mn Choose the…EasyOther
9 Apr 2024, Shift 1 · Q61Compare the energies of following sets of quantum numbers for multielectron system. (A) $n=4, l=1$ (B) $n=4, l=2$ (C) $n=3, l=1$ (D)…EasySingle correct
29 Jan 2024, Shift 1 · Q61The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is :EasySingle correct
31 Jan 2024, Shift 2 · Q62The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) areEasySingle correct
8 Apr 2023, Shift 2 · Q81The number of atomic orbitals from the following having 5 radial nodes is ____________. 7s, 7p, 6s, 8p, 8dEasyNumerical value
13 Apr 2023, Shift 2 · Q83The orbital angular momentum of an electron in 3s orbital is $\frac{xh}{2\pi}$ . The value of $x$ is ______ (nearest integer)EasyNumerical value
25 Jul 2022, Shift 1 · Q62Which of the following sets of quantum numbers is not allowed ?EasySingle correct
28 Jul 2022, Shift 1 · Q61Identify the incorrect statement from the following.MediumSingle correct
24 Jun 2022, Shift 1 · Q62Consider the following pairs of electrons (A) (a) $n=3, l=1, m_l=1, m_s=+\frac{1}{2}$ (b) $n=3, l=2, m_l=1, m_s=+\frac{1}{2}$ (B) (a)…EasyOther
29 Jun 2022, Shift 1 · Q62Which of the following statements are correct ? (A) The electronic configuration of Cr is [Ar] $3d^5\,4s^1$ . (B) The magnetic quantum…EasyOther
16 Mar 2021, Shift 2 · Q53The number of orbitals with $n=5$ , $m_l=+2$ is ________. (Round off to the Nearest Integer).EasyNumerical value
18 Mar 2021, Shift 1 · Q32A certain orbital has no angular nodes and two radial nodes. The orbital is :EasySingle correct
2 Apr 2017 (offline) · Q45The group having isoelectronic species is :EasySingle correct