Class 12 Chemistry - BIHAR
Coordination Compounds
Coordination Compounds is a crucial chapter in Class 12 Chemistry for Bihar (BSEB) students, bridging inorganic and structural chemistry. It covers how central metal atoms bond with molecules or ions called ligands to form complex species. You will learn Werner's theory of coordination, IUPAC nomenclature rules for naming complex salts, isomerism in coordination entities, and bonding theories like Valence Bond Theory (VBT) and Crystal Field Theory (CFT). This chapter holds significant weight in board exams, frequently featuring direct questions on IUPAC naming, drawing geometrical isomers, and explaining color or magnetic properties using CFT.
Start Learning FreeKey Concepts
Coordination Entity
A central metal atom or ion bonded to a fixed number of surrounding ions or molecules (ligands) enclosed in square brackets.
Ligands
Neutral molecules or ions that donate a pair of electrons to the central metal atom, classified as monodentate, bidentate, or ambidentate based on donor sites.
Coordination Number
The total number of coordinate bonds formed by ligands with the central metal atom in a complex.
Werner's Coordination Theory
Postulates that metals exhibit primary valencies (ionizable, oxidation state) and secondary valencies (non-ionizable, coordination number).
Crystal Field Theory (CFT)
An electrostatic model that explains the splitting of d-orbitals in metal complexes into different energy levels under the influence of ligand fields, accounting for color and magnetism.
Important Formulas
Board Exam Info
In the Bihar Board (BSEB) Class 12 Chemistry examination, Coordination Compounds typically carries around 4 to 6 marks. Questions usually include 1-2 objective (MCQ) questions, short answer questions on IUPAC nomenclature or types of isomerism, and long-answer or numerical questions based on Crystal Field Theory or magnetic moment calculations.
Frequently Asked Questions
How do I write the IUPAC name of a coordination compound?
Name the cation first, then the anion. Inside the coordination sphere, name the ligands alphabetically before the central metal, followed by the metal's oxidation state in Roman numerals in parentheses. Add the suffix '-ate' to the metal if the complex is an anion.
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 structure and does not lose its individual ions completely in solution.
Why do coordination compounds exhibit color?
Color is due to d-d electronic transitions. When white light falls on the complex, electrons absorb a specific wavelength of light to jump from lower to higher energy d-orbitals (split by CFT), and the remaining complementary color is transmitted.
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