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Coordination Compounds — Syllabus

ICSE · Class 12 · Chemistry

What Coordination Compounds covers in ICSE Class 12 Chemistry: 4 topics, for the 2026-27 session. Part of the ICSE Class 12 Chemistry syllabus.

105 questions40 flashcards5 concepts

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A diagram illustrating a coordination compound, clearly distinguishing and labeling the central metal ion, ligands, coordination sphere, primary valency (ionizable counter ions), and secondary valency
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4 Topics · ICSE Class 12 Chemistry · 2026-27

Topics in Coordination Compounds

1

1. Basic Concepts and Definitions

  • A coordination compound contains a central metal atom or ion permanently attached to ligands.
  • Ligands are atoms, ions, or molecules that donate at least one lone pair of electrons to the metal.
  • Coordination compounds retain their identity in aqueous solution, unlike double salts.
2

2. Ligands and Their Classification

  • Ligands may be neutral, anionic, or rarely cationic.
  • Neutral ligands include H2O, NH3, CO, NO, pyridine, and ethylenediamine.
  • Anionic ligands include F-, Cl-, Br-, I-, CN-, OH-, CH3COO-, NO2-, SCN-, and others.
3

3. Werner's Theory and Modern View of Coordination Compounds

  • Alfred Werner prepared cobalt-ammine chloride complexes in 1892.
  • Werner proposed that metals show two kinds of valency: primary and secondary.
  • Primary valency is ionisable and corresponds to oxidation state.
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4. Nomenclature of Coordination Compounds

  • In cationic complexes, the complex cation is named first and then the anion.
  • In anionic complexes, the cation is named first and then the complex anion.
  • Neutral complexes are written as single words.

Key Concepts

Central concept: Coordination compounds as metal-ligand systems with special bonding, naming, isomerism, stability, and applications

Basic definitionImportant termsClassification of complexesLigandsWerner's theoryNomenclatureIsomerismValence bond theory

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Frequently Asked Questions

What are the important topics in Coordination Compounds for ICSE Class 12 Chemistry?
Key topics in Coordination Compounds include Basic Concepts and Definitions, Ligands and Their Classification, Werner's Theory and Modern View of Coordination Compounds, Nomenclature of Coordination Compounds. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How should I revise Coordination Compounds for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 105 practice questions on Coordination Compounds. 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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