CBSE 11 Chemistry · U4
Chemical Bonding and Molecular Structure
CBSE Class 11 Chemistry Unit IV: Kossel-Lewis approach, ionic bond, bond parameters, VSEPR theory, valence bond theory, hybridisation, molecular orbital theory for homonuclear diatomic molecules, and hydrogen bonding.
Test yourself
A focused, distraction-free run through 50 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 4.1
Kossel-Lewis Approach and Ionic Bonding
Octet idea, Lewis symbols, electron transfer, ionic or electrovalent bond formation and lattice-based reasoning
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Topic 4.2
Covalent Bonding, Lewis Structures and Bond Parameters
Shared electron pairs, Lewis structures, resonance, bond length, bond enthalpy, bond angle and dipole moment
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Topic 4.3
VSEPR Theory and Molecular Shapes
Electron-pair repulsion, molecular geometry, lone-pair effects and shape prediction
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Topic 4.4
Valence Bond Theory, Hybridisation, Sigma and Pi Bonds
Orbital overlap, directional covalent bonds, hybrid orbitals and sigma/pi bond counting
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Topic 4.5
Molecular Orbital Theory and Hydrogen Bonding
Bond order, magnetic character of homonuclear diatomic molecules and inter-/intramolecular hydrogen bonding
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