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IB Chemistry HL 2.2.3 Coordination Bonds Questions

Use exam questions to identify coordination bonds in molecules and complexes, name the lone-pair donor and distinguish dative from other bonding.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Identify the specific dative/coordination bond in a displayed molecule, ion or transition-element complex, including the donor–acceptor pair.
  • State which atom or ligand donates the lone pair that becomes the shared coordinate bonding pair.
  • Distinguish a coordination covalent bond from ordinary covalent bonding, ionic attraction and intermolecular forces in the stated species.

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Study 2.2.3—Coordination bonds conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 2.2.3 Coordination Bonds Questions question 1

[Maximum number: 2]

Solid ionic compounds form crystal lattices.

Cobalt also forms chlorides with the formula CoCl2\mathrm{CoCl}_{2}.

Hydrated cobalt (II) ions, Co(H2O)62+\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}{ }^{2+}, are pink. Describe the interaction between the cobalt ion and a water molecule in terms of the type of bond and how this bond is formed.

Type of bond:
How the bond forms:
CoCl42−\mathrm{CoCl}_{4}{ }^{2-} ions are blue.

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