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Saturday, 31 October

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JEE Main 2026 · ChemistryMultiple choiceSingle correctMediumCalculation

JEE Main 4 April 2026, Shift 1, Chemistry Q52

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

What is the ratio of wave number of first line (lowest energy line) of Balmer series of H atomic spectrum to first line of its Brackett series?

(1) $5:1$
(2) $5:0.81$ Official answer
(3) $5:1.75$
(4) $5:27$

Official answer

Option 2

NTA final key.

Chapter: Structure of Atom
Topic: Bohr's Atomic Theory
Idea tested: Rydberg Formula and Transitions

Same idea in other shifts

Asked 2× in all

4 Sep 2020, Shift 2 · Q31The shortest wavelength of H atom in the Lyman series is $\lambda_1$ . The longest wavelength in the Balmer series of $\mathrm{He^+}$ is :MediumSingle 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.