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Saturday, 31 October

JEE Main 2025 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 2 April 2025, Shift 1, Chemistry Q52

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

According to Bohr's model of hydrogen atom, which of the following statement is incorrect ?
  1. (1)Radius of 4th4^{\text{th}} orbit is four times larger than that of 2nd2^{\text{nd}} orbit
  2. (2)Radius of 6th6^{\text{th}} orbit is three times larger than that of 4th4^{\text{th}} orbitOfficial answer
  3. (3)Radius of 8th8^{\text{th}} orbit is four times larger than that of 4th4^{\text{th}} orbit
  4. (4)Radius of 3rd3^{\text{rd}} orbit is nine times larger than that of 1st1^{\text{st}} orbit

Official answer

Option 2

NTA final key.

Chapter
Structure of Atom
Topic
Bohr's Atomic Theory
Idea tested
Bohr Radius Calculation

Same idea in other shifts

Asked 8× in all
  1. 4 Apr 2026, Shift 2 · Q52The species having identical radii according to the Bohr's theory are: A. H (first orbit) B. He+\mathrm{He^+} (first orbit) C.…EasyOther
  2. 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
  3. 26 Jun 2022, Shift 1 · Q63If the radius of the 3rd^{rd} Bohr's orbit of hydrogen atom is r3_3 and the radius of 4th^{th} Bohr's orbit is r4_4. Then :EasySingle correct
  4. 3 Aug 2021, Shift 2 · Q53The ratio of radii for the first and third orbits of hydrogen atom is 1:x1 : x. The value of xx is ‾\underline{\hspace{2em}}. (Integer…EasyNumerical value
  5. 8 Jan 2020, Shift 2 · Q29The radius of the second Bohr orbit, in terms of the Bohr radius, a0\mathrm{a_0}, in Li2+\mathrm{Li^{2+}} is :EasySingle correct
  6. 5 Sep 2020, Shift 1 · Q41The difference between the radii of 3rd3^{\mathrm{rd}} and 4th4^{\mathrm{th}} orbits of Li2+\mathrm{Li^{2+}} is ΔR1\Delta R_1. The difference…MediumSingle correct
  7. 2 Apr 2017 (offline) · Q38The radius of the second Bohr orbit for hydrogen atom is : (Planck's Const. h=6.6262×10−34h=6.6262\times10^{-34} Js; mass of electron…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 108 of the 174 JEE Main shifts held from 2017 to 2026.