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Coordination Chemistry — Syllabus

Tamil Nadu Board · Class 12 · Chemistry

What Coordination Chemistry covers in Tamil Nadu Board Class 12 Chemistry: 4 topics, for the 2026-27 session. Topics include Coordination Compounds vs.

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4 Topics · Tamil Nadu Board Class 12 Chemistry · 2026-27

Topics in Coordination Chemistry

1

1. Coordination Compounds vs Double Salts

  • Double salts dissociate completely into simple ions in solution (e.g., Mohr's salt: FeSO₄·(NH₄)₂SO₄·6H₂O)
  • Coordination compounds do NOT dissociate into simple ions in solution - the complex ion retains its identity
  • Example: K₃[Fe(SCN)₆] gives ferric-thiocyanate complex, NOT simple Fe³⁺ and SCN⁻
2

2. Werner's Theory of Coordination Compounds

  • Proposed in 1893 before electron discovery - based purely on reaction chemistry
  • Primary valence = oxidation state of central metal (always satisfied by negative ions)
  • Secondary valence = coordination number (satisfied by ligands, can be negative, neutral, or positive ions)
3

3. Important Terms in Coordination Chemistry

  • Coordination entity: Central atom + array of ligands (enclosed in square brackets)
  • Central atom/ion: Occupies center, accepts electron pairs (Lewis acid), forms coordinate covalent bonds
  • Ligands: Atoms/groups bonded to central metal; donor atom is the atom directly bonded to metal
4

4. IUPAC Nomenclature of Coordination Compounds

  • Cation named first, then anion (regardless of complexity)
  • Within complex ion: ligands named in alphabetical order, then central metal
  • Anionic ligand names end in 'o' (e.g., cyano, chlorido, fluoro)

Key Concepts

Double salts like Mohr's salt (FeSO₄·(NH₄)₂SO₄·6H₂O)Werner proposed that elements have twoThe coordination sphere is the complexNaming follows specific rulesStructural isomers have the same molecular

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Frequently Asked Questions

What are the important topics in Coordination Chemistry for Tamil Nadu Board Class 12 Chemistry?
Key topics in Coordination Chemistry include Coordination Compounds vs Double Salts, Werner's Theory of Coordination Compounds, Important Terms in Coordination Chemistry, IUPAC Nomenclature of Coordination Compounds. Study these first, then practise questions on each for the Tamil Nadu Board Class 12 board exam.
How should I revise Coordination Chemistry for the Tamil Nadu Board Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Coordination Chemistry. 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 Tamil Nadu Board Class 12 Chemistry Syllabus

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