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Introduction Paragraph
Prepare effectively for your CBSE Class 11 Chemistry board exams with this online practice test on “Energy Levels and Transitions” from Chapter 2: Structure of Atom (Part A: Physical Chemistry). This quiz covers all key concepts from the NCERT Chemistry textbook, including Bohr’s model, quantum numbers, emission and absorption spectra, and energy transitions in hydrogen-like atoms.
Each question in this MCQ set is designed to test your conceptual clarity and application skills, helping you master topics like photon energy, Rydberg formula, and electron excitation. The questions strictly follow NCERT guidelines and CBSE examination standards, ensuring complete syllabus coverage and exam readiness.
Attempt this 30-question online test to evaluate your understanding and receive instant feedback with explanations. Whether you’re revising for school exams or competitive entrances like NEET or JEE (Main), this quiz will help you strengthen your grasp on the structure of atoms and related energy transitions.
Sample MCQs (with Answers & Explanations)
Q1. In the Bohr model, the energy of an electron in the nth orbit is proportional to:
A) n² B) 1/n C) 1/n² D) n
Answer: C) 1/n²
Explanation: According to Bohr’s model, energy of an orbit En=−13.6/n2E_n = -13.6/n^2 eV for hydrogen; hence, energy is inversely proportional to n².
Q2. Which spectral line of hydrogen is observed when an electron jumps from n = 3 to n = 2?
A) Lyman B) Balmer C) Paschen D) Brackett
Answer: B) Balmer
Explanation: The Balmer series corresponds to electronic transitions ending at n = 2, visible in the spectrum.
Q3. The transition producing the highest energy photon in hydrogen is:
A) n = 3 → 2 B) n = 4 → 2 C) n = 5 → 1 D) n = 2 → 1
Answer: C) n = 5 → 1
Explanation: The largest energy difference occurs for the transition ending at n = 1, giving the highest photon energy.
Q4. The Rydberg constant for hydrogen is approximately:
A) 1.097 × 10⁷ m⁻¹ B) 6.022 × 10²³ mol⁻¹ C) 3 × 10⁸ m/s D) 9.11 × 10⁻³¹ kg
Answer: A) 1.097 × 10⁷ m⁻¹
Explanation: The Rydberg constant (R) is used in spectral calculations for hydrogen-like atoms and equals 1.097 × 10⁷ m⁻¹.
Q5. When an electron in a hydrogen atom absorbs energy, it:
A) Moves to a lower orbit B) Gets ionized C) Moves to a higher orbit D) Emits a photon
Answer: C) Moves to a higher orbit
Explanation: Absorption of energy excites the electron to a higher energy level (larger n), while emission occurs during de-excitation.