JEE Main 2026 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 6 April 2026, Shift 2, Chemistry Q52

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

The Bohr radius of a hydrogen like species is 70.53 pm. The species and the stationary state (

n

) are respectively (Given : Hydrogen atom Bohr radius is 52.9 pm)

(1) $\mathrm{Li^{2+}}$ , 3
(2) $\mathrm{He^{+}}$ , 3
(3) $\mathrm{He^{+}}$ , 2
(4) $\mathrm{Li^{2+}}$ , 2Official answer

Official answer

Option 4

NTA final key.

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

Same idea in other shifts

Asked 5× in all

4 Apr 2026, Shift 2 · Q52The species having identical radii according to the Bohr's theory are: A. H (first orbit) B. $\mathrm{He^+}$ (first orbit) C.…EasyOther
2 Apr 2025, Shift 1 · Q52According to Bohr's model of hydrogen atom, which of the following statement is incorrect ?EasySingle correct
3 Aug 2021, Shift 2 · Q53The ratio of radii for the first and third orbits of hydrogen atom is $1 : x$ . The value of $x$ is $\underline{\hspace{2em}}$ . (Integer…EasyNumerical value
2 Apr 2017 (offline) · Q38The radius of the second Bohr orbit for hydrogen atom is : (Planck's Const. $h=6.6262\times10^{-34}$ 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 42 of the 174 JEE Main shifts held from 2017 to 2026.