Class 12 Chemistry - GUJARAT
Coordination Compounds
The chapter 'Coordination Compounds' in Class 12 Chemistry for Gujarat (GSEB) students explores complex compounds containing central metal atoms bonded to surrounding ligands via coordinate covalent bonds. You will learn about Werner's coordination theory, IUPAC nomenclature of coordination entities, and isomerism in coordination compounds. The chapter also dives deep into bonding theories like Valence Bond Theory (VBT) and Crystal Field Theory (CFT), explaining their magnetic properties and color. This is a high-scoring and conceptually vital chapter for both board exams and competitive entrances like GUJCET and NEET, carrying significant weightage.
Start Learning FreeKey Concepts
Coordination Entity
A central metal atom or ion bonded to a fixed number of ions or molecules (ligands) enclosed in a square bracket.
Ligands and Denticity
Neutral molecules or ions that donate a pair of electrons to the central metal atom. Denticity refers to the number of donor atoms a ligand uses to bind to the metal.
Coordination Number
The total number of coordinate bonds formed by the ligands with the central metal atom or ion in a complex.
Werner's Theory
Proposes that metals exhibit two types of valencies: primary valency (ionizable, oxidation state) and secondary valency (non-ionizable, coordination number).
Crystal Field Theory (CFT)
An electrostatic model that explains the splitting of d-orbitals of the central metal ion under the influence of approaching ligands, accounting for color and magnetism.
Important Formulas
Board Exam Info
In the Gujarat (GSEB) Class 12 Chemistry board exam, this chapter typically carries around 4 to 6 marks. Questions frequently include IUPAC naming of complex compounds, explaining hybridization and geometry using VBT, calculating magnetic moments, and drawing structural or stereoisomers.
Frequently Asked Questions
How do I determine the oxidation state of the central metal atom?
Assign an 'x' to the central metal, add the charges of all ligands and counter ions, and equate the sum to the total charge on the coordination sphere to solve for x.
What is the difference between a double salt and a coordination compound?
A double salt dissociates completely into all its constituent ions in water (e.g., Mohr's salt), whereas a coordination compound retains its complex entity identity and does not dissociate completely.
How do I know whether a ligand is strong-field or weak-field?
Refer to the Spectrochemical Series. Ligands like CO, CN-, and en are strong-field and cause pairing of electrons, while halides and H2O are weak-field ligands.
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