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CBSE Class 11 Chemistry MCQs – Lewis Structure and Shapes of Molecules Quiz
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NCERT Class 11 Chapter 4 Chemistry MCQs – Chemical Bonding and Molecular Geometry
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Free CBSE Class 11 Chemistry Quiz – Lewis Structures and Bond Angles
📚 Introduction
CBSE Class 11 Chemistry MCQs – Lewis Structure and Shapes of Molecules are designed to help students master molecular geometry concepts based on NCERT Class 11 Chemistry Chapter 4: Chemical Bonding and Molecular Structure. Understanding how atoms combine, share electrons, and form specific molecular shapes is crucial for grasping advanced concepts in chemical bonding.
This topic focuses on the Lewis dot structures, octet rule, formal charge calculations, resonance, and VSEPR theory, which help explain molecular geometry, bond angles, and hybridization. These NCERT-based multiple-choice questions test your conceptual understanding of bonding, molecular polarity, and structure — key topics in both CBSE Class 11 board exams and competitive exams like JEE and NEET.
Each question includes detailed feedback and reasoning, enabling effective learning through self-assessment. Attempt this 30-minute interactive quiz to evaluate your preparation and gain a deeper understanding of how Lewis structures determine the shape and stability of molecules.
🧩 Sample MCQs (with Answers and Explanations):
Q1. The octet rule helps in explaining:
a) Atomic radius b) Electron configuration c) Bond formation d) Ionization energy
✅ Answer: c) Bond formation
Explanation: The octet rule states that atoms tend to form bonds to achieve eight electrons in their valence shell, similar to noble gases.
Q2. Which molecule violates the octet rule?
a) CH₄ b) H₂O c) BF₃ d) NH₃
✅ Answer: c) BF₃
Explanation: Boron in BF₃ has only six electrons around it, making it an electron-deficient compound that violates the octet rule.
Q3. What is the shape of NH₃ according to VSEPR theory?
a) Linear b) Trigonal planar c) Trigonal pyramidal d) Tetrahedral
✅ Answer: c) Trigonal pyramidal
Explanation: NH₃ has three bonding pairs and one lone pair, which gives it a trigonal pyramidal shape with bond angles around 107°.
Q4. Which molecule has a linear structure?
a) H₂O b) CO₂ c) NH₃ d) BF₃
✅ Answer: b) CO₂
Explanation: CO₂ is linear because the central carbon has two double bonds and no lone pairs, giving a bond angle of 180°.
Q5. The formal charge on oxygen in O₃ (ozone) is:
a) 0 on all atoms b) -1 on one O and +1 on another c) +2 d) -2
✅ Answer: b) -1 on one O and +1 on another
Explanation: In ozone, resonance occurs between two equivalent structures where one oxygen has a +1 and another has a -1 formal charge.
✅ Highlight: These MCQs are strictly NCERT-aligned and perfect for CBSE Class 11 board exam preparation, providing a solid conceptual foundation in Lewis structures and molecular geometry.