The JEE Main Chemistry section requires speed and accuracy, along with a thorough understanding of the Quantum Mechanical Model of Atom. This article provides a set of JEE Main PYQs on Quantum Mechanical Model of Atom to help you understand the topic and improve your problem-solving skills with the help of detailed solutions by ensuring conceptual clarity, which will help you in the JEE Main 2026 preparation.
Whether you're revising the basics or testing your knowledge, these JEE Main PYQs will serve as a valuable practice resource.
The JEE Main 2026 exam is likely to continue on the same pattern as JEE Main 2025. Out of 90 questions, students can expect a fair mix from all three subjects. To get an edge, going through JEE Main previous year questions (PYQs) is one of the best strategies.
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JEE Main PYQs on Quantum Mechanical Model of Atom
1.
In a multielectron atom, which of the following orbitals described by three quantum numbers will have the same energy in absence of electric and magnetic fields?
A. \( n = 1, l = 0, m_l = 0 \)
B. \( n = 2, l = 0, m_l = 0 \)
C. \( n = 2, l = 1, m_l = 1 \)
D. \( n = 3, l = 2, m_l = 1 \)
E. \( n = 3, l = 2, m_l = 0 \)
Choose the correct answer from the options given below:- D and E Only
- C and D Only
- B and C Only
- A and B Only
2.
Which of the following sets of quantum numbers is not allowed?\(n=1, l=0, m_l=0, m_s=− \frac{1}{2}\)
\(n=3,l=2,m_l=−1,m_s= \frac{1}{2}\)
\(n=5,l=2,m_l=−3,m_s=−\frac{1}{2}\)
\(n=4,l=3,m_l=−2,m_s=\frac{1}{2}\)
3.
The correct set of four quantum numbers for the valence electrons of rubidium atom $(Z = 37)$ is- $5,0,0,+\frac{1}{2}$
- $5,1,0,+\frac{1}{2}$
- $5,1,1,+\frac{1}{2}$
- $5,0,1,+\frac{1}{2}$
4.
Which of the following sets of quantum numbers is not allowed?- $n =3,1=2, m _{ l }=0, s =+\frac{1}{2}$
- $n =3,1=2, m _1=-2, s =+\frac{1}{2}$
- $n =3,1=3, m _{ l }=-3, s =-\frac{1}{2}$
- $n =3,1=0, m _1=0, s =-\frac{1}{2}$
5.
Given below are two statements:
- Statement I is false but Statement II is true
- Statement I is true but Statement II is false
- Both Statement I and Statement II are true
- Both Statement I and Statement II are false
6.
The product (P) formed in the following reaction is:
7.
Given below are two statements:
In light of the above statements, choose the correct answer from the options given below:- Statement I is false but Statement II is true
- Statement I is true but Statement II is false
- Both Statement I and Statement II are true
- Both Statement I and Statement II are false
8.
Which of the following sets of quantum numbers is not allowed?
\(n=3,l=2,m_l=0,s=+\frac{1}{2}\)
\(n=3,l=2,m_l=-2,s=+\frac{1}{2}\)
\(n=3,l=3,m_l=-3,s=-\frac{1}{2}\)
\(n=3,l=0,m_l=0,s=-\frac{1}{2}\)
9.
In a multielectron atom, which of the following orbitals described by three quantum numbers will have the same energy in absence of electric and magnetic fields?
A. \( n = 1, l = 0, m_l = 0 \)
B. \( n = 2, l = 0, m_l = 0 \)
C. \( n = 2, l = 1, m_l = 1 \)
D. \( n = 3, l = 2, m_l = 1 \)
E. \( n = 3, l = 2, m_l = 0 \)
Choose the correct answer from the options given below:- D and E Only
- C and D Only
- B and C Only
- A and B Only
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