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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 7 April 2025, Shift 2, Chemistry Q51

Question 51 of 75 in this shift, Chemistry question 1 of 25, Section A.

The extra stability of half-filled subshell is due to : (A) Symmetrical distribution of electrons (B) Smaller coulombic repulsion energy (C) The presence of electrons with the same spin in non-degenerate orbitals (D) Larger exchange energy (E) Relatively smaller shielding of electrons by one another Indentify the correct statements :
  1. (1)(A), (B) and (D) only
  2. (2)(B), (C) and (D) only
  3. (3)(A), (B), (D) and (E) onlyOfficial answer
  4. (4)(B), (D) and (E) only

Official answer

Option 3

NTA final key.

Chapter
Structure of Atom
Topic
Quantum Numbers
Idea tested
Calculation of Exchange Energy Pairs

Same topic in other shifts

All Quantum Numbers questions
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  4. 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
  5. 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
  6. 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

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.