Question detail
Which of the following statements correctly defines a ligand?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Transition metals (A-level only)
Question
- A. A ligand is a molecule that donates electrons to a metal ion.
- B. A ligand is a metal ion that forms a complex.
- C. A ligand is a type of transition metal.
- D. A ligand is a compound that does not bond with metals.
Answer
A ligand is a molecule that donates electrons to a metal ion.
Explanation
A ligand is defined as a molecule or ion that can donate a pair of electrons to a metal ion to form a coordinate bond. This is essential in the formation of complex ions.
Common mistake
Misunderstanding Coordination Number
Students often confuse the coordination number with the number of ligands attached to the central metal ion, thinking they are the same.
The coordination number refers to the total number of coordinate bonds formed between the central metal ion and the ligands, which may not always equal the number of ligands due to bidentate or polydentate ligands. To clarify, remember that each ligand can form multiple bonds. For example, in a complex with two bidentate ligands, the coordination number would be 4, even though there are only 2 ligands.
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