IT JEE Chemistry Practice Paper 4 – Atomic Structure – PYQs

IIT JEE Chemistry Practice Paper – Part 4 revisits the essential topic of Atomic Structure with another fresh set of multiple-choice questions inspired by previous years’ IIT JEE Main and Advanced exams. This section is designed to deepen your conceptual clarity on Bohr’s model, quantum numbers, electron configuration, de Broglie wavelength, and related concepts. By attempting these 10 MCQs, you can strengthen your fundamentals and boost your problem-solving speed — key to scoring high in competitive exams.

1. Which of the following has the maximum number of electrons?

   H^–
   He
   Li⁺
   Be²⁺

2. The angular momentum of an electron in the third orbit of hydrogen is:

   h/2π
   2h/2π
   3h/2π
   √3 h/2π

3. The wavelength of an electron moving with a velocity of 6 × 10⁶ m/s is approximately:

   1.21 × 10^-10 m
   1.21 × 10^-9 m
   1.21 × 10^-11 m
   1.21 × 10^-12 m

4. Which of the following sets of quantum numbers is not possible?

   n=2, l=0, m=0, s=+1/2
   n=3, l=2, m=3, s=-1/2
   n=4, l=3, m=-3, s=+1/2
   n=1, l=0, m=0, s=-1/2

5. The maximum number of electrons in a shell with principal quantum number n is:

   2n
   2n²
   n²
   n

6. Which one of the following statements is correct about the energy of an electron in a hydrogen atom?

   It is directly proportional to n
   It is inversely proportional to n²
   It is directly proportional to 1/n
   It is independent of n

7. In hydrogen spectrum, the series that appears in the visible region is:

   Lyman
   Balmer
   Paschen
   Brackett

8. The number of radial nodes for 4p orbital is:

   0
   1
   2
   3

9. Which of the following will have the highest energy in hydrogen atom?

   1s
   2s
   2p
   3s

10. The uncertainty in position of an electron is 1 × 10^-10 m. The uncertainty in its momentum will be at least (h = 6.63 × 10^-34 Js):

    5.27 × 10^-25 kg·m/s
    5.27 × 10^-24 kg·m/s
    6.63 × 10^-25 kg·m/s
    6.63 × 10^-24 kg·m/s

Submit

This quiz offers IIT JEE aspirants an effective way to test and strengthen their understanding of key concepts in Chemistry. By practicing with questions inspired by previous years’ exams, students become familiar with the exam’s difficulty level and question patterns. The instant feedback system helps identify mistakes, learn correct answers, and understand the reasoning through concise explanations. Scoring is based on the actual marking scheme (4 marks per correct answer), which builds exam temperament. Regular practice with such quizzes improves speed, accuracy, and confidence, ensuring better preparation and a higher chance of securing top ranks in the IIT JEE.