Relevant Titles:
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CBSE Class 11 Chemistry MCQs – Electronic Configuration Practice Test
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Class 11 Chemistry Chapter 2 MCQs – Structure of Atom Quiz
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Electronic Configuration MCQs for Class 11 Chemistry – NCERT Based
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CBSE Class 11 Physical Chemistry MCQs – Electron Arrangement Exercises
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NCERT Class 11 Chemistry Online Test – Electronic Configuration Questions
📚 Introduction Paragraph
Electronic Configuration is a vital concept in Chapter 2: Structure of Atom of CBSE Class 11 Chemistry. It describes the arrangement of electrons in various shells, subshells, and orbitals of an atom according to principles like Aufbau principle, Pauli’s exclusion principle, and Hund’s rule of maximum multiplicity. Understanding how electrons fill orbitals helps students explain chemical reactivity, periodic trends, and bonding behavior.
This online MCQ practice test is carefully designed as per the NCERT Class 11 Chemistry syllabus, making it perfect for CBSE board exam preparation and entrance exams like JEE Main and NEET. The questions cover conceptual, numerical, and application-based problems that test understanding of electron distribution, energy levels, and orbital filling order.
By practicing these Electronic Configuration MCQs, students will strengthen their grasp of fundamental atomic theory, improve problem-solving accuracy, and gain confidence for exams.
🧩 Sample MCQs (with Answers & Explanations):
Q1. The correct electronic configuration of nitrogen (Z = 7) is:
A. 1s² 2s² 2p³ B. 1s² 2s² 2p⁴ C. 1s² 2s¹ 2p⁴ D. 1s² 2s² 2p²
✅ Answer: A
💡 Explanation: Nitrogen has 7 electrons; 2 fill 1s, 2 fill 2s, and the remaining 3 go to 2p orbitals (Hund’s rule).
Q2. The element with configuration [Ne] 3s² 3p⁵ is:
A. Sulfur B. Chlorine C. Argon D. Phosphorus
✅ Answer: B
💡 Explanation: The configuration corresponds to atomic number 17 — Chlorine (Cl).
Q3. Which rule states that no two electrons in an atom can have the same set of four quantum numbers?
A. Hund’s Rule B. Pauli’s Exclusion Principle C. Aufbau Principle D. Bohr’s Postulate
✅ Answer: B
💡 Explanation: Pauli’s exclusion principle ensures unique quantum states for every electron.
Q4. Which of the following represents the correct order of orbital filling?
A. 1s → 2s → 2p → 3s → 3p → 4s → 3d B. 1s → 2p → 2s C. 1s → 3p D. 3s → 2p
✅ Answer: A
💡 Explanation: Orbitals are filled in increasing energy order according to the (n + l) rule.
Q5. The number of unpaired electrons in oxygen atom (1s² 2s² 2p⁴) is:
A. 1 B. 2 C. 3 D. 0
✅ Answer: B
💡 Explanation: Two unpaired electrons occupy two of the 2p orbitals singly following Hund’s rule.