Class 12 Chemistry - ODISHA
Coordination Compounds
The chapter Coordination Compounds in Class 12 Chemistry for Odisha BSE students explores the fascinating world of complex compounds where a central metal atom or ion is bonded to a fixed number of molecules or ions called ligands. You will learn about double salts versus coordination compounds, Werner's coordination theory, IUPAC nomenclature of mononuclear coordination complexes, and bonding theories including Valence Bond Theory (VBT) and Crystal Field Theory (CFT). Understanding isomerism and the biological importance of these compounds is crucial for scoring high marks in your board examinations.
Start Learning FreeKey Concepts
Coordination Entity
A coordination entity consists of a central metal atom or ion bonded to a fixed number of oppositely charged or neutral molecules/ions (ligands), usually enclosed in square brackets.
Ligands
Neutral molecules or ions that donate a pair of electrons to the central metal atom to form a coordinate bond. They can be monodentate, bidentate, or polydentate based on their donor atoms.
Coordination Number
The total number of coordinate bonds formed by ligands with the central metal atom or ion in a complex entity.
Werner's Theory
A theory proposing 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 considers the metal-ligand bond to be ionic, arising from electrostatic interactions between the positive metal ion and negative dipole of ligands, explaining color and magnetic properties.
Important Formulas
Board Exam Info
In the Odisha BSE (CHSE) Class 12 Chemistry board examination, Coordination Compounds typically carries around 4 to 6 marks. Questions frequently include IUPAC naming of complexes, explaining isomerism, calculating the magnetic moment using spin-only formulas, and applying Valence Bond Theory or Crystal Field Theory to predict geometry and hybridization.
Frequently Asked Questions
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 identity and does not dissociate completely into all its constituent ions.
How do we determine the oxidation state of the central metal atom?
Assign 'x' to the central metal's oxidation state, sum it with the charges of all ligands and counter ions, and equate the total to the net charge of the complex compound to solve for x.
Why do coordination compounds show color?
Color arises due to d-d electronic transitions, where electrons absorb specific wavelengths of visible light to jump from lower to higher energy d-orbitals in the crystal 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