AP Intermediate 2nd Year The d- and f-Block Elements & Coordination Compounds — practice questions — page 4

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The d- and f-Block Elements & Coordination Compounds questions and exercises with answers

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Worked practice questions

A COORDINATION COMPOUND consists of a central metal atom (or ion) BONDED to a set of surrounding molecules or ions, called

ligands
isotopes
buffer pairs
co-monomers

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Correct answer: A. ligands

1. syllabus introduces the vocabulary of coordination chemistry. 2. A coordination compound has a CENTRAL metal atom or ion (typically a transition metal) bonded to a definite number of ANCILLARY species via dative (coordinate covalent) bonds. 3. The ancillary species are called LIGANDS — neutral molecules (NH$_3$, H$_2$O, CO) or anions (Cl$^-$, OH$^-$, CN$^-$) that donate a lone pair to the metal. 4. Other options are unrelated: isotopes (B) refer to nuclear identity; buffer pairs (C) to pH chemistry; co-monomers (D) to polymerisation. _Source: syllabus Chemistry Part 1, Ch 5 "Coordination Compounds", §5.1 (Werner's Theory and basic terms), p. 1–2._

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Chelate or ambidentate?

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Items

Item
Uses two donor atoms at the same time
Category
Chelate
Item
Forms unusually stable complexes
Category
Chelate
Item
EDTA⁴⁻ binding a metal ion
Category
Chelate
Item
Has two different donor atoms, uses one
Category
Ambidentate
Item
NO₂⁻
Category
Ambidentate
Item
SCN⁻
Category
Ambidentate

Categories

Item
Chelate
Item
Ambidentate

Both involve more than one candidate donor atom, but a chelate uses them together while an ambidentate ligand picks one. Source: syllabus Chemistry Part I, Ch 5 Coordination Compounds.

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Ethylenediamine (en) is best described as a:

Monodentate ligand, with one donor atom per molecule
Bidentate ligand, with two N donor atoms per molecule
Tridentate ligand, with three donor atoms in chelation
Hexadentate ligand, with six donor atoms like EDTA

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Correct answer: B. Bidentate ligand, with two N donor atoms per molecule

Ethylenediamine has two nitrogen donor atoms; bidentate.

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