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Chemical Bonding and Molecular Structure — Revision Notes

CBSE · Class 11 · Chemistry

Chemical Bonding and Molecular Structure revision notes for CBSE Class 11 Chemistry: 4 topics in quick points.

67 questions72 flashcards5 concepts

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Key Topics to Revise

1

1. Nature of Chemical Bond and Kössel-Lewis Approach

  • A chemical bond is the attractive force that holds atoms, ions, or other constituents together in a chemical species.
  • Kössel and Lewis independently gave a satisfactory electron-based explanation of bonding in 1916.
  • Lewis pictured the atom as a positively charged Kernel with an outer shell that can hold a maximum of eight electrons.
2

2. Ionic or Electrovalent Bond and Lattice Enthalpy

  • An ionic bond forms due to electrostatic attraction between positive and negative ions.
  • Electrovalence is equal to the number of unit charges on the ion.
  • Calcium has electrovalence +2 and chlorine has electrovalence -1.
3

3. Covalent Bond, Lewis Structures, Formal Charge, Resonance and Bond Parameters

  • A covalent bond forms by sharing of electron pair(s) between atoms.
  • A single covalent bond is formed when two atoms share one electron pair.
  • A double bond is formed when two atoms share two pairs of electrons.
4

4. Polarity, Dipole Moment and Fajans' Rules

  • A polar covalent bond has unequal sharing of electrons.
  • Dipole moment is a vector quantity and depends on both bond polarity and molecular shape.
  • Dipole moment is zero in symmetric molecules such as BeF2 and BF3 because bond dipoles cancel.

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Full Notes

Key Concepts

A chemical bond is the attractiveKössel and Lewis independently explained bondAtoms form bonds to achieveLewis symbols show valence electrons asFormal charge is a bookkeeping tool

Frequently Asked Questions

What are the important topics in Chemical Bonding and Molecular Structure for CBSE Class 11 Chemistry?
Key topics in Chemical Bonding and Molecular Structure include Nature of Chemical Bond and Kössel-Lewis Approach, Ionic or Electrovalent Bond and Lattice Enthalpy, Covalent Bond, Lewis Structures, Formal Charge, Resonance and Bond Parameters, Polarity, Dipole Moment and Fajans' Rules. Study these first, then practise questions on each for Class 11 exams.
How should I revise Chemical Bonding and Molecular Structure for Class 11 exams?
Learn the core ideas first, then work through the 67 practice questions on Chemical Bonding and Molecular Structure. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All CBSE Class 11 Chemistry Revision Notes

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