JEE Main 2026 · ChemistryMultiple choiceOtherEasyApplication

JEE Main 4 April 2026, Shift 2, Chemistry Q52

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

The species having identical radii according to the Bohr's theory are: A. H (first orbit) B.

\mathrm{He^+}

(first orbit) C.

\mathrm{He^+}

(Second orbit) D.

\mathrm{Li^{2+}}

(first orbit) E.

\mathrm{Be^{3+}}

(Second orbit) Choose the correct answer from the options given below:

(1)A and C Only
(2)A and E OnlyOfficial answer
(3)B and E Only
(4)C and D Only

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 5× in all

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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.