Coordination Compounds
Free NCERT-aligned study resource for the 2026–27 academic session.
CBSE weightage: 7 marks. This unit is part of the official 70-mark Chemistry theory course for 2026–27. citeturn0search11
1. What You Need to Learn
Werner’s theory; terminology; nomenclature; isomerism; bonding; metal carbonyls; importance and applications.
2. Core Concepts & Formulae
Know coordination entity, central metal atom/ion, ligand, coordination number, oxidation state and counter ion. Learn systematic naming and distinguish ionisation, linkage, coordination, geometrical and optical isomerism. Crystal-field ideas help explain colour and magnetic behaviour.
3. Common Mistakes
Do not confuse coordination number with oxidation state. While naming complexes, calculate the metal oxidation state first and arrange ligand names correctly. Check whether the complex ion is cationic, anionic or neutral.
4. Exam-Focused Practice
- Name coordination compounds from formulas.
- Find oxidation state and coordination number.
- Draw possible geometrical isomers.
- Explain why coordination compounds are important in biological systems, metallurgy and analytical chemistry.
5. Quick Revision Checklist
- Can you define the key terms without looking at the book?
- Can you explain the main trend/reaction/mechanism with a reason?
- Can you solve a numerical or predict a product independently?
- Can you answer an application or competency-based question?