Skip to main content
Super TutorResources
Chapter 5 of 5
QuestionsNotesFlashcardsSummaryFormulasQuizConceptsSyllabusPlan
Syllabus

Coordination Compounds

Punjab Board · Class 12 · Chemistry

Complete topic list for Coordination Compounds in Punjab Board Class 12 Chemistry. Key concepts, sub-topics, and what to focus on for board exams.

45 questions36 flashcards5 concepts

Interactive on Super Tutor

Studying Coordination Compounds? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for syllabus and more.

Try Super Tutor — Free

1,000+ Class 12 students started this chapter today

An infographic summarizing various applications of coordination compounds in analytical chemistry, metallurgy, industry, and medicine.
Super Tutor

This is just one of 5+ visuals inside Super Tutor's Coordination Compounds chapter

Explore the full set
4 Topics · Punjab Board Class 12 Chemistry

Topics in Coordination Compounds

1

Werner's Theory of Coordination Compounds

  • Alfred Werner (1866–1919) was a Swiss chemist who first systematically explained coordination compounds and won the Nobel Prize in Chemistry in 1913.
  • Werner proposed two types of valences for metal ions: PRIMARY VALENCE (ionisable, satisfied by negative ions) and SECONDARY VALENCE (non-ionisable, satisfied by neutral molecules or negative ions).
  • Primary valence = oxidation state of the metal; Secondary valence = coordination number of the metal.
2

Key Definitions and Terminology

  • COORDINATION ENTITY: The central metal atom/ion plus all its ligands, enclosed in square brackets.
  • CENTRAL ATOM/ION: The metal atom or ion at the centre of the coordination entity; acts as a Lewis acid (electron pair acceptor). Examples: Ni²⁺ in [NiCl₂(H₂O)₄], Co³⁺ in [CoCl(NH₃)₅]²⁺, Fe³⁺ in [Fe(CN
  • LIGAND: Ions or molecules bonded to the central atom; act as Lewis bases (electron pair donors). Can be simple ions (Cl⁻), small molecules (H₂O, NH₃), or large molecules (EDTA).
3

Nomenclature of Coordination Compounds

  • IUPAC rules are used for systematic naming. The cation is always named FIRST, then the anion.
  • FORMULA WRITING ORDER: Central metal first, then ligands listed ALPHABETICALLY. Entire coordination entity enclosed in square brackets [ ].
  • NAMING ORDER: Ligands are named ALPHABETICALLY before the central metal name. (Reverse of formula writing for ligand order.)
4

Isomerism in Coordination Compounds

  • ISOMERS: Compounds with same molecular formula but different arrangement of atoms, resulting in different properties.
  • TWO MAIN TYPES: (A) Stereoisomerism — same bonds, different spatial arrangement; (B) Structural isomerism — different bonds.
  • GEOMETRIC ISOMERISM (Stereoisomerism): Arises in heteroleptic complexes due to different spatial arrangements of ligands.

Key Concepts

A coordination compound consists ofAlfred Werner proposed that metals exhibitLigands are ions or molecules bondedCoordination number (CN) is the numberThe oxidation number of the central

Frequently Asked Questions

What are the important topics in Coordination Compounds for Punjab Board Class 12 Chemistry?
Key topics in Coordination Compounds include Classification of Isomerism in Coordination Compounds, Coordination Compounds - Complete Chapter Overview, Coordination Compounds – Complete Chapter Overview. These are the concepts Punjab Board Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Coordination Compounds — Punjab Board Class 12 Chemistry?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and 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.

More resources for Coordination Compounds

All 5 chapters — Punjab Board Class 12 Chemistry Syllabus

For serious students

Get the full Coordination Compounds chapter — for free.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan for Punjab Board Class 12 Chemistry.

Try Super Tutor Free
Try the full chapter — Free