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Spread the Happiness. Assertion and Reason Statements Feedback: 9008271516XII_CHEMISTRY_NEW_CHAPTER-05: COORDINATION COMPOUNDS _ A&R TEST ITEMS
# Correct Assertion Correct Reason
5.1 Werner’s Theory of Coordination Compounds
Central metal forms coordinate bonds with ligands. Ligands donate electron pairs to the metal ion, creating a central
1
metal complex.
Werner's theory revolutionized coordination Introduced coordinate bonding and explained structures, enabling
2
chemistry understanding. further advancements.
Biomolecule arrangement dictates their function in Specific interactions with biomolecules (e.g., electron transfer)
3
biological systems. depend on coordination compound structure.
Chlorophyll exemplifies a coordination compound in The central metal in chlorophyll facilitates oxygen transport through
4
biological processes. ligand interactions.
Coordination compounds possess diverse Catalysis, material properties (metallurgy), and drug development
5
functionalities across fields. (medicine) showcase their practical applications.
Coordination number limits ligand bonding to a Electronic configuration and steric factors define the maximum
6
central metal ion. number of ligands a metal ion can directly bond with.
Coordination number influences spatial arrangement A higher coordination number can lead to increased crowding and
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of ligands. ligand repulsion, affecting spatial organization.
Coordination polyhedra depict 3D geometries formed These polyhedra represent the specific shapes resulting from how
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by ligand arrangements. ligands are positioned around the central metal ion.
Werner's coordination entities laid the groundwork Introduced the concept of coordination entities (complexes) as
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for systematic study. distinct units for analysis in coordination chemistry.
Understanding coordination spheres is essential for Variations in ligand arrangements (coordination spheres) lead to
10 explaining structural diversity. significant differences in structures and properties of coordination
compounds.
Counter ions ensure electrical neutrality in Since complex ions can have charges, counter ions (opposite charge)
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coordination compounds. maintain overall neutrality of the formula.
Dissociation behavior differentiates double salts from Double salts fully dissociate in water, while complex ions remain
12
coordination compounds. intact due to strong metal-ligand bonds.
Conductivity measurements supported Werner's The presence of charged species (complex ions) moving in solution
13 theory. during conductivity measurements validated their existence.
The Nobel Prize awarded to Werner highlights his Recognizes his groundbreaking work in elucidating the structure and
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contributions. bonding in coordination compounds.
5.2 Definitions of Some Important Terms Pertaining to Coordination Compounds
Coordination entities form from a central metal and Lewis acid-base interactions drive this assembly, with the metal
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ligands. acting as a Lewis acid accepting electrons from donor ligands.
The central atom dictates ligand arrangement in Electronic configuration of the central atom governs preferred
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coordination entities. geometries, influencing the 3D structure of the complex.
Ligands surrounding the central atom impact complex Beyond electron donation, ligands can influence factors like
17 properties. solubility and reactivity, shaping the overall behavior of the
complex.
Coordination number (CN) determines complex This crucial parameter dictates how ligand donor atoms position
18 stability and arrangement. around the metal, impacting both spatial organization and stability.
The coordination sphere (square brackets) represents It isolates the central metal and directly bonded ligands, excluding
19 the core complex. dissociable counter ions for clear visualization and formula writing.
Coordination polyhedra describe the 3D ligand These polyhedra depend on factors like CN, ligand size, and electron
20 arrangement. distribution around the central metal ion, revealing the complex's
geometry.
Oxidation number of the central atom reflects its This concept aids in predicting electron transfer processes and
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hypothetical charge. determining oxidation states for balancing redox reactions.
Denticity of ligands (unidentate, didentate, Polydentate ligands, with multiple donor atoms, form more stable
22 polydentate) affects chelate stability. chelate complexes due to the multipoint attachment and the
chelate effect.
Homoleptic vs. heteroleptic complexes exhibit distinct The type and number of donor groups bound to the central metal
23 properties. ion influence factors like symmetry, reactivity, and the ligand field,
leading to varied properties.
Coordination number (CN) affects metal ion reactivity Knowing the CN allows for predicting favorable ligand
24 and geometry. arrangements, ultimately impacting the reactivity and preferred
geometries of the metal ion.
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