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CBSE Class 11 Chemistry MCQs – Bohr’s Model and Dual Nature Practice Test
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📚 Introduction Paragraph
Understanding Bohr’s Model and the Dual Nature of Matter and Radiation is essential for mastering Chapter 2: Structure of Atom in CBSE Class 11 Chemistry. Bohr’s atomic model introduced the revolutionary concept of quantized energy levels, explaining the stability of atoms and the spectral lines of hydrogen. Later, the Dual Nature of Light and Matter, supported by Planck’s quantum theory and de Broglie’s hypothesis, established the wave–particle duality that forms the foundation of modern quantum mechanics.
This online MCQ practice test is designed strictly as per the NCERT Class 11 Chemistry syllabus, making it ideal for CBSE board exam preparation. These carefully curated questions test conceptual clarity on topics like Bohr’s postulates, spectral transitions, photoelectric effect, Planck’s equation, and de Broglie wavelength.
By practicing these Bohr’s Model and Dual Nature MCQs, students can strengthen their conceptual understanding, boost exam readiness, and build confidence for both CBSE board exams and competitive exams like JEE and NEET.
🧩 Sample MCQs (with Answers & Explanations):
Q1. Bohr’s model successfully explained the line spectrum of which atom?
A. Helium B. Hydrogen C. Lithium D. Sodium
✅ Answer: B. Hydrogen
💡 Explanation: Bohr’s model is valid only for single-electron systems like hydrogen and hydrogen-like ions (He⁺, Li²⁺).
Q2. According to Bohr, electrons revolve around the nucleus in:
A. Elliptical paths B. Random orbits C. Stationary circular orbits D. Spiral paths
✅ Answer: C. Stationary circular orbits
💡 Explanation: Bohr proposed that electrons move in fixed circular paths (stationary orbits) without radiating energy.
Q3. Planck’s quantum theory states that:
A. Energy is emitted continuously
B. Energy is quantized and emitted in discrete packets
C. Energy is infinite
D. Energy depends on mass
✅ Answer: B
💡 Explanation: Planck suggested that energy is emitted or absorbed in discrete quantities called quanta (E = hν).
Q4. The de Broglie wavelength of a moving electron is given by:
A. λ = h / p B. λ = p / h C. λ = hv D. λ = h × p
✅ Answer: A
💡 Explanation: λ = h/p shows that matter exhibits wave nature, where p is the momentum of the particle.
Q5. The photoelectric effect provided evidence for:
A. Wave nature of light B. Particle nature of light C. Magnetic nature of light D. Random energy emission
✅ Answer: B
💡 Explanation: The photoelectric effect demonstrated that light consists of energy quanta called photons, proving its particle nature.