Relevant Titles:
-
CBSE Class 11 Chemistry MCQs – Quantum Numbers and Orbitals Practice Test
-
Class 11 Chemistry Chapter 2 MCQs – Structure of Atom Online Quiz
-
Quantum Numbers and Orbitals MCQs for Class 11 Chemistry – NCERT Based
-
CBSE Class 11 Physical Chemistry MCQs – Quantum Numbers and Electron Orbitals
-
NCERT Class 11 Chemistry Online Test – Quantum Numbers and Orbitals Practice
📚 Introduction Paragraph
Understanding Quantum Numbers and Orbitals is fundamental to mastering Chapter 2: Structure of Atom in CBSE Class 11 Physical Chemistry. Quantum numbers define the position, energy, and spin orientation of electrons within atoms — forming the foundation for the modern atomic theory. A clear grasp of principal (n), azimuthal (l), magnetic (mₗ), and spin (mₛ) quantum numbers helps students predict orbital shapes, electron configurations, and chemical behavior.
This online MCQ practice test is carefully curated as per the latest NCERT Class 11 Chemistry syllabus, making it ideal for CBSE board exam preparation. Each multiple-choice question is designed to test conceptual clarity and application of theory, ensuring students strengthen their understanding of atomic structure, orbitals, and electron distribution.
Practicing these Quantum Numbers and Orbitals MCQs will help students build a strong conceptual foundation in Physical Chemistry, improve accuracy in theoretical questions, and boost confidence for CBSE board and entrance exams like JEE and NEET.
🧩 Sample MCQs (with Answers & Explanations):
Q1. Which quantum number indicates the energy level of an electron?
A. Azimuthal quantum number (l) B. Principal quantum number (n) C. Magnetic quantum number (mₗ) D. Spin quantum number (mₛ)
✅ Answer: B
💡 Explanation: The principal quantum number (n) defines the main energy level or shell in which an electron resides.
Q2. The azimuthal quantum number determines:
A. Shape of the orbital B. Energy level C. Orientation D. Spin of electron
✅ Answer: A
💡 Explanation: The azimuthal quantum number (l) defines the shape of the orbital (s, p, d, f) and the subshell type.
Q3. How many orbitals are present in a p-subshell?
A. 1 B. 2 C. 3 D. 4
✅ Answer: C
💡 Explanation: The p-subshell has three orbitals corresponding to mₗ values of -1, 0, and +1.
Q4. Which quantum number describes the spin of an electron?
A. n B. l C. mₗ D. mₛ
✅ Answer: D
💡 Explanation: The spin quantum number (mₛ) indicates the spin orientation of an electron: +½ or –½.
Q5. The total number of orbitals in the third energy level (n=3) is:
A. 3 B. 6 C. 9 D. 18
✅ Answer: C
💡 Explanation: The number of orbitals in a shell = n² → 3² = 9 orbitals in the third energy level.