Relevant Titles
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Structure of Atom Class 11 Chemistry MCQs with Answers for Board Exams
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CBSE Class 11 Chemistry Chapter 2 – Structure of Atom Quiz Online
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Important MCQs on Structure of Atom for Class 11 Chemistry (NCERT Based)
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CBSE Class 11 Structure of Atom Objective Questions with Solutions
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Free Online Practice Test – Structure of Atom Class 11 Chemistry MCQs
Introduction Paragraph
Strengthen your preparation for the CBSE Class 11 Chemistry Board Exams with this online practice test on “Structure of Atom” from Part A: Physical Chemistry (Chapter 2). This chapter forms the foundation of atomic theory and is a crucial part of the NCERT Chemistry syllabus.
The Structure of Atom covers the evolution of atomic models, quantum mechanical concepts, and the arrangement of electrons within atoms — topics essential for both school exams and competitive entrance tests like NEET and JEE (Main). Through this online quiz, students can revise important theories such as Bohr’s model, quantum numbers, electron configurations, and spectral lines, while testing their understanding of fundamental principles.
Each question is aligned with NCERT standards and provides instant feedback and explanations to help you identify strengths and areas for improvement. Attempt this 30-question interactive test to evaluate your conceptual clarity and enhance your exam readiness for the CBSE Class 11 Chemistry Board Examination.
Sample MCQs (with Answers and Explanations)
Q1. The Bohr model of the atom explains the:
A) Continuous spectra of hydrogen B) Discrete line spectra of hydrogen C) Spectrum of solids D) Photoelectric effect
Answer: B) Discrete line spectra of hydrogen
Explanation: Bohr’s model introduced quantized energy levels, explaining why hydrogen emits discrete spectral lines.
Q2. The principal quantum number (n) determines the:
A) Shape of orbital B) Energy and size of orbital C) Spin of electron D) Orientation of orbital
Answer: B) Energy and size of orbital
Explanation: The value of ‘n’ indicates the main energy level and the average distance of the electron from the nucleus.
Q3. Which of the following series lies in the ultraviolet region of hydrogen spectrum?
A) Balmer B) Lyman C) Paschen D) Brackett
Answer: B) Lyman
Explanation: The Lyman series corresponds to transitions ending at n=1 and lies in the ultraviolet region.
Q4. The azimuthal quantum number (l) defines:
A) Size of orbital B) Shape of orbital C) Orientation of orbital D) Spin of electron
Answer: B) Shape of orbital
Explanation: The azimuthal or angular momentum quantum number determines the shape of the orbital (s, p, d, f).
Q5. According to the Heisenberg Uncertainty Principle:
A) Position and momentum can be measured simultaneously with accuracy.
B) Position and momentum cannot be measured exactly at the same time.
C) Energy and wavelength are unrelated.
D) Electrons revolve in fixed circular paths.
Answer: B) Position and momentum cannot be measured exactly at the same time.
Explanation: The principle states that the product of uncertainties in position and momentum is always ≥ h/4π.