Coordination Chemistry — Flashcards
Tamil Nadu Board · Class 12 · Chemistry
34 flashcards for Coordination Chemistry (Tamil Nadu Board Class 12 Chemistry) to test yourself on key terms and facts.
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What is the difference between a double salt and a coordination compound?
Answer
Double Salt: Loses identity in solution, dissociates into constituent simple ions. Example: Mohr's salt [FeSO₄·(NH₄)₂SO₄·6H₂O] gives Fe²⁺, NH₄⁺, SO₄²⁻ ions separately. Coordination Compound: Does not…
Define primary valence and secondary valence according to Werner's theory. What are their modern equivalents?
Answer
Primary Valence: The charge that a metal atom/ion would have if all ligands were removed. Modern equivalent = Oxidation State of the metal. Example: In [Co(NH₃)₆]Cl₃, Co has primary valence of +3. Se…
Explain the concept of coordination sphere and ionisation sphere in coordination compounds.
Answer
Coordination Sphere (Inner Sphere): Contains the central metal atom/ion and all ligands directly bonded to it. Enclosed in square brackets. Groups here are firmly attached and remain together in solut…
In the complex CrCl₂·4H₂O, when treated with AgNO₃, only 1 mole of AgCl is precipitated. Determine the structural formula and assign secondary valence.
Answer
Given: Only 1 Cl⁻ is ionisable (free) in outer sphere, so 2 Cl⁻ must be in inner coordination sphere. Since coordination number of Cr is 6: - 2 Cl⁻ in inner sphere (coordinate with Cr) - 4 H₂O in inn…
Define coordination entity and list its essential components.
Answer
Coordination Entity: An ion or neutral molecule composed of a central atom (usually a metal) and an array of other atoms or groups of atoms (ligands) bonded to it. Essential Components: 1. Central at…
What is coordination number? Give examples of common coordination numbers and their geometries.
Answer
Coordination Number: The number of ligand donor atoms bonded to a central metal ion in a complex. Common Coordination Numbers and Geometries: - CN = 2 → Linear. Example: [Cu(CN)₂]⁻, [Ag(NH₃)₂]⁺ - CN …
Calculate the oxidation state of central metal in [Fe(CN)₆]⁴⁻.
Answer
Formula: Net Charge = (Oxidation State of Metal) + [(Number of Ligands) × (Charge on Ligand)] Given: [Fe(CN)₆]⁴⁻ Net charge = -4 Number of CN⁻ ligands = 6 Charge on each CN⁻ = -1 Calculation: -4 = x…
Calculate the oxidation state of Co in [Co(NH₃)₅Cl]²⁺.
Answer
Formula: Net Charge = (Oxidation State of Metal) + [(Charge on Ligands)] Given: [Co(NH₃)₅Cl]²⁺ Net charge = +2 NH₃ ligands = 5 (neutral, charge = 0) Cl⁻ ligands = 1 (charge = -1) Calculation: +2 = x…
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