Class 12 Chemistry — Chapter 5: Coordination Compounds
Chapter 5: Coordination Compounds is a chapter in Class 12 Chemistry (Part 1), part of the CBSE NCERT curriculum followed by over 25 million students across India. This chapter covers 6 topics including Werner's Theory of Coordination Compounds, Definitions of Coordination Entity and Central Atom/Ion, Ligands, Denticity, and Chelation. BrainWeave provides free AI-powered explanations — by voice or text, in Hindi or English — with no signup required.
What you'll learn
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▸Werner's Theory of Coordination CompoundsCore conceptWerner's theoryprimary valencesecondary valencecoordination numberAgCl precipitation
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▸Definitions of Coordination Entity and Central Atom/IonCore conceptcoordination entitycentral atomcentral ionLewis acidcomplex
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▸Ligands, Denticity, and ChelationCore conceptliganddenticityunidentatebidentatechelate
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▸Coordination Number and Coordination SphereCore conceptcoordination numbercoordination spheredonor atomssigma bondscounter ions
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▸Double Salts vs. Complex Compoundsdouble saltcomplex compounddissociationMohr's saltK₄[Fe(CN)₆]
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▸Ambidentate Ligandsambidentate liganddonor atomsNO₂⁻SCN⁻linkage
Chapter Summary
Understand the postulates of Werner's theory, distinguishing between primary (ionisable) and secondary (non-ionisable) valences, and how this theory explains the structure and properties of coordination compounds.
Define a coordination entity as the central metal atom/ion bonded to a fixed number of ligands, and identify the central atom/ion, which acts as a Lewis acid.
Define ligands and classify them based on the number of donor atoms (denticity) as unidentate, bidentate, or polydentate. Understand that complexes with multidentate ligands are called chelate complexes and are generally more stable.
Define coordination number as the total number of sigma bonds from ligands to the central atom/ion. Understand the coordination sphere as the central ion and its attached ligands, enclosed in square brackets.
Differentiate between double salts, which dissociate completely into constituent ions in solution, and complex compounds, where the complex ion remains intact.
Identify ambidentate ligands as species that possess two different donor atoms but can only ligate through one at a time, such as the nitrite (NO₂⁻) and thiocyanate (SCN⁻) ions.
Practice Questions from this Chapter
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- Explain coordination compounds simply. Get Solution →
- List everyday coordination compound examples. Get Solution →
- Describe Werner's key ideas. Get Solution →
- Who was the first scientist to formulate his ideas about the structures of coordination compounds? Get Solution →
- The biological molecule haemoglobin is a coordination compound of which metal? Get Solution →
- According to Werner's theory, the primary valences are normally satisfied by what? Get Solution →
- What is the term for the central atom/ion and the ligands attached to it, enclosed in a square bracket? Get Solution →
- Complexes in which a metal is bound to only one kind of donor group, e.g., [Co(NH₃)₆]³⁺, are known as what? Get Solution →
Did you know?
- 💡 Chlorophyll, which makes plants green, is a special coordination compound.
- 💡 Your blood's red color comes from hemoglobin, an iron coordination compound.
- 💡 Some shiny metals, like nickel, are purified using coordination compounds.
- 💡 The first person to understand coordination compounds won a Nobel Prize.
- 💡 Vitamin B12, essential for your body, contains a cobalt coordination compound.
Frequently Asked Questions
How many topics are covered in this chapter?
This chapter covers 6 key topics: Werner's Theory of Coordination Compounds, Definitions of Coordination Entity and Central Atom/Ion, Ligands, Denticity, and Chelation, Coordination Number and Coordination Sphere, Double Salts vs. Complex Compounds, and more. The BrainWeave AI tutor explains each one with examples.
Is Chapter 5: Coordination Compounds important for board exams?
Yes — Class 12 is a CBSE board exam year, and every NCERT chapter is part of the syllabus. Use BrainWeave's AI tutor to master this chapter, then practice with the auto-generated quizzes and mind maps.
Can I get NCERT solutions for this chapter in Hindi?
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