Structure Of Atom — JEE Main Previous Year Questions

How many JEE Main questions come from Structure Of Atom?

Structure Of Atom has contributed 189 questions to Joint Entrance Examination (Main) papers between 2016 and 2026 — an average of about 17 questions a year. That count is measured from EByAi’s bank of 55,289 JEE Main questions, not estimated from a syllabus. Every one of the 189 questions carries a written, step-by-step solution, and each is tagged to Structure Of Atom within Chemistry, so you can drill this chapter across every year at once instead of hunting through paper PDFs. Practising a chapter’s full PYQ history is the fastest way to learn the patterns examiners reuse.

Sample Structure Of Atom questions from real JEE Main papers

These are 5 real questions from the bank — exactly as asked, with the answer one tap away. All 189 Structure Of Atom questions (with full written solutions) are available in practice.

1. Question 1 · JEE Main 2026

   Which of the following statements regarding the energy of the stationary state is true in the following one-electron systems?
   1. (A)$+2.18\times 10^{-18}\mathrm{J}$ for second orbit of ${\mathrm{He}}^{+}$ion
   2. (B)$+8.72\times 10^{-18}\mathrm{J}$ for first orbit of ${\mathrm{He}}^{+}$ion
   3. (C)$-1.09\times 10^{-18}\mathrm{J}$ for second orbit of H atom.
   4. (D)$-2.18\times 10^{-18}\mathrm{J}$ for third orbit of ${\mathrm{Li}}^{2+}$ ion
   Show answerAnswer

   Answer: (D) $-2.18\times 10^{-18}\mathrm{J}$ for third orbit of ${\mathrm{Li}}^{2+}$ ion

2. Question 2 · JEE Main 2026

   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. (A)5 : 1
   2. (B)5 : 0.81
   3. (C)5 : 1.75
   4. (D)5 : 27
   Show answerAnswer

   Answer: (B) 5 : 0.81

3. Question 3 · JEE Main 2026

   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. (A)${\mathrm{Li}}^{2+},3$
   2. (B)${\mathrm{He}}^{+},3$
   3. (C)${\mathrm{He}}^{+},2$
   4. (D)${\mathrm{Li}}^{2+},2$
   Show answerAnswer

   Answer: (D) ${\mathrm{Li}}^{2+},2$

4. Question 4 · JEE Main 2026

   Consider the following spectral lines for atomic hydrogen : A. First line of Paschen series B. Second line of Balmer series C. Third line of Paschen series D. Fourth line of Bracket series The correct arrangement of the above lines in ascending order of energy is :
   1. (A)D < C < A < B
   2. (B)A < B < C < D
   3. (C)D < A < C < B
   4. (D)C < D < B < A
   Show answerAnswer

   Answer: (C) D < A < C < B

5. Question 5 · JEE Main 2025

   According to Bohr's model of hydrogen atom, which of the following statements is incorrect?
   1. (A)Radius of $4^{\text{th }}$ orbit is four times larger than that of $2^{\text{nd }}$ orbit
   2. (B)Radius of $8^{\text{th }}$ orbit is four times larger than that of $4^{\text{th }}$ orbit
   3. (C)Radius of $6^{\text{th }}$ orbit is three times larger than that of $4^{\text{th }}$ orbit
   4. (D)Radius of $3^{\text{rd }}$ orbit is nine times larger than that of $1^{\text{st }}$ orbit
   Show answerAnswer

   Answer: (C) Radius of $6^{\text{th }}$ orbit is three times larger than that of $4^{\text{th }}$ orbit

Structure Of Atom questions by year

FAQs

More JEE Main Chemistry chapters

• Coordination Compounds (318)
• Aldehydes Ketones And Carboxylic Acids (257)
• Basics Of Organic Chemistry (254)
• Compounds Containing Nitrogen (237)
• Chemical Bonding And Molecular Structure (232)
• Some Basic Concepts Of Chemistry (222)
• D And F Block Elements (205)
• Thermodynamics (202)
• Electrochemistry (188)
• Chemical Kinetics And Nuclear Chemistry (186)
• Biomolecules (180)
• Haloalkanes And Haloarenes (170)

All JEE Main Chemistry chapters →JEE Main overview →