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Friday, 9 October

JEE Main 2026 · ChemistryMultiple choiceOtherEasyRecall

JEE Main 5 April 2026, Shift 1, Chemistry Q53

Question 53 of 75 in this shift, Chemistry question 3 of 25, Section A.

Identify the correct statements from the following : A. Heisenberg uncertainty principle is applicable to electrons. B. The size of 2px2p_x orbital is less than the size of 3px3p_x orbital. C. The energy of 2s orbital of H atom is equal to the energy of 2s orbital of Li. D. The electronic configuration of Cr is [Ar] 3d5 4s13d^5\,4s^1 Choose the correct answer from the options given below:
  1. (1)A, B and C Only
  2. (2)A, B and D OnlyOfficial answer
  3. (3)B, C and D Only
  4. (4)A, C and D Only

Official answer

Option 2

NTA final key.

Chapter
Structure of Atom
Topic
Quantum Numbers
Idea tested
Anomalous Electron Configurations

Same idea in other shifts

Asked 3× in all
  1. 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
  2. 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

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.