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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 3 April 2025, Shift 1, Chemistry Q52

Question 52 of 75 in this shift, Chemistry question 2 of 25, Section A.

Which of the following postulate of Bohr's model of hydrogen atom is not in agreement with quantum mechanical model of an atom?
  1. (1)An atom can take only certain distinct energies E1,E2,E3\mathrm{E_1, E_2, E_3}, etc. These allowed states of constant energy are called the stationary states of atom.
  2. (2)An atom in a stationary state does not emit electromagnetic radiation as long as it stays in the same state.
  3. (3)When an electron makes a transition from a higher energy stationary state to a lower energy stationary state, then it emits a photon of light.
  4. (4)The electron in a H atom's stationary state moves in a circle around the nucleus.Official answer

Official answer

Option 4

NTA final key.

Chapter
Structure of Atom
Topic
Bohr's Atomic Theory
Idea tested
Limitations of Bohr Model

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  5. 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
  6. 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

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.