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Coordination Compounds

CBSE · Class 12 · Chemistry

Quick revision notes for Coordination Compounds — CBSE Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

91 questions20 flashcards5 concepts

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An infographic presenting the spectrochemical series, which orders common ligands by their ability to cause crystal field splitting. Explain the significance of strong field vs. weak field ligands.
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Key Topics to Revise

1

Werner's Theory and Basic Concepts

  • Alfred Werner proposed primary valence (oxidation state) and secondary valence (coordination number)
  • Primary valences are ionizable and satisfied by anions, secondary valences are non-ionizable
  • Coordination entities have definite geometry: octahedral (CN=6), tetrahedral (CN=4), square planar (CN=4)
2

Ligand Types and Denticity

  • Unidentate ligands: Cl⁻, NH₃, H₂O, CN⁻ (one donor atom)
  • Bidentate ligands: en (ethylenediamine), ox²⁻ (oxalate) (two donor atoms)
  • Polydentate ligands: EDTA⁴⁻ (hexadentate - 6 donor atoms)
3

IUPAC Nomenclature Rules

  • Cation named first, then anion (regardless of which contains complex)
  • Within coordination sphere: ligands named alphabetically before metal
  • Anionic ligands end in -o (chlorido, cyano, oxalato)
4

Isomerism in Coordination Compounds

  • Structural Isomerism: Different bonding patterns - linkage, coordination, ionization, solvate
  • Stereoisomerism: Same bonds, different spatial arrangements - geometrical and optical
  • Geometrical isomerism: cis-trans in square planar/octahedral, fac-mer in octahedral

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Full Notes

Key Concepts

Alfred Werner proposed that metals exhibitCoordination EntityFormula writingTwo main typesMetal uses hybrid orbitals (sp³

Frequently Asked Questions

What are the important topics in Coordination Compounds for CBSE Class 12 Chemistry?
Coordination Compounds covers several key topics that are frequently asked in CBSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Coordination Compounds — CBSE Class 12 Chemistry?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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