Class 12 Chemistry - HARYANA
Coordination Compounds
The chapter Coordination Compounds in Class 12 Chemistry explores complex compounds where metal atoms are bound to surrounding molecules or ions via coordinate bonds. For Haryana Board (BSEH) students, this is a highly scoring and conceptually rich inorganic chemistry chapter. It covers important topics like Werner's coordination theory, IUPAC nomenclature of mononuclear coordination compounds, isomerism (both structural and stereoisomerism), and bonding theories including Valence Bond Theory (VBT) and Crystal Field Theory (CFT). Mastering this chapter is essential for board exams as questions involving IUPAC naming, hybridization, magnetic behavior, and crystal field splitting are regularly asked.
Start Learning FreeKey Concepts
Coordination Entity
A electrically charged or neutral species consisting of a central metal atom or ion bonded to a fixed number of ions or molecules (ligands).
Ligands
Neutral molecules or ions bound to the central metal atom in the coordination entity, acting as Lewis bases by donating an electron pair.
Coordination Number
The total number of coordinate bonds formed by ligand donor atoms with the central metal atom or ion in a complex.
Werner's Coordination Theory
Postulates that metals show two types of valencies: primary valency (ionizable, oxidation state) and secondary valency (non-ionizable, coordination number).
Crystal Field Theory (CFT)
An electrostatic model that considers ligands as point charges and explains the splitting of d-orbitals in metal complexes, accounting for their colors and magnetic properties.
Important Formulas
Board Exam Info
In the Haryana Board (BSEH) Class 12 Chemistry examination, this chapter typically carries around 3 to 5 marks. Common question types include writing IUPAC names of coordination compounds, determining the hybridization and magnetic moment using VBT or CFT, identifying isomerism, and explaining coordination entities based on Werner's theory.
Frequently Asked Questions
How do we find the oxidation state of the central metal atom in a coordination compound?
Assign variable 'x' to the central metal, add the charges of all ligands and counter ions, and equate the sum to the overall charge of the complex (zero for neutral complexes).
What is the difference between a double salt and a coordination compound?
A double salt dissociates completely into simple ions in water (e.g., Mohr's salt), whereas a coordination compound retains its complex entity and does not dissociate completely into its constituent ions.
How do we calculate the spin-only magnetic moment of a coordination complex?
Use the formula mu = sqrt(n(n+2)) Bohr Magnetons (BM), where 'n' represents the number of unpaired d-electrons determined from the metal's electronic configuration and ligand field.
Learn Coordination Compounds with Your AI Tutor
10 different ways to study this chapter. Free for 3 chapters per day.
Lecture
Key Points
Interactive
Quiz
Flashcards