Coordination Compounds
Punjab Board · Class 12 · Chemistry
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Explore the full setWhat is a coordination compound? Provide its definition and an example.
Answer
A coordination compound is a compound formed when ligands (ions or neutral molecules) bond to a central metal atom or ion. The metal-ligand bond involves the donation of electron pairs from ligands to…
State Werner's postulates of coordination compounds.
Answer
Werner's main postulates (1898): (1) Metals show two types of linkages - primary valence (ionisable) and secondary valence (non-ionisable). (2) Primary valences are satisfied by negative ions. (3) Sec…
Distinguish between double salt and coordination compound.
Answer
Double Salt: Dissociates completely into simple ions when dissolved in water. Example: Mohr's salt FeSO₄·(NH₄)₂SO₄·6H₂O → FeSO₄ + (NH₄)₂SO₄. Coordination Compound: Does not dissociate into individual …
Define ligand and classify ligands based on donor atoms.
Answer
Ligands are ions or molecules bound to the central metal ion. Classification: (1) Unidentate: Single donor atom. Example: Cl⁻, H₂O, NH₃. (2) Didentate: Two donor atoms. Example: ethane-1,2-diamine (en…
Calculate the coordination number of metal in [Fe(C₂O₄)₃]³⁻.
Answer
Step 1: Identify the ligand - C₂O₄²⁻ (oxalate) is didentate (has 2 donor atoms). Step 2: Count total donor atoms - 3 oxalate ligands × 2 donor atoms each = 6 donor atoms. Step 3: Coordination number =…
What is coordination number? Determine CN in [Ni(NH₃)₄]²⁺ and [PtCl₆]²⁻.
Answer
Coordination number (CN) is the number of sigma bonds (coordinate bonds) between ligand donor atoms and the central metal atom/ion. It represents the number of nearest ligand atoms to the metal. For […
What is the coordination sphere? Give an example.
Answer
The coordination sphere comprises the central metal atom/ion and all the ligands directly attached to it. It is enclosed in square brackets. Example: In K₄[Fe(CN)₆], the coordination sphere is [Fe(CN)…
Define coordination polyhedron and name common geometries.
Answer
Coordination polyhedron is the spatial arrangement of ligand donor atoms directly bonded to the central metal atom. It defines the shape of the complex. Common coordination polyhedra: (1) Tetrahedral …
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