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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceOtherMediumMulti-step

JEE Main 8 April 2025, Shift 2, Chemistry Q51

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

Correct 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 which ms=−12m_s = -\frac{1}{2}. B. There is only one electron in pz\mathrm{p_z} orbital. C. The last electron goes to orbital with n=2n = 2 and l=1l = 1. D. The sum of angular nodes of all the atomic orbitals is 1. Choose the correct answer from the options given below:
  1. (1)A and B Only
  2. (2)C and D Only
  3. (3)A and C OnlyOfficial answer
  4. (4)A, C and D Only

Official answer

Option 3

NTA final key.

Chapter
Structure of Atom
Topic
Quantum Numbers
Idea tested
Spin Quantum Number

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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.