Question detail
What is the coordination number of a complex ion with six ligands?
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. 2
- B. 4
- C. 6
- D. 8
Answer
6
Explanation
The coordination number of a complex ion is defined as the number of ligand bonds to the central metal ion. In this case, with six ligands, the coordination number is 6.
Common mistake
Incorrect Representation of Ligand Substitution
Students often write ligand substitution reactions without balancing the equation or including the correct charges on the ions involved.
To fix this, always ensure that the equation is balanced and that the charges on the complex ions and ligands are correctly represented. For example, in the substitution of water by ammonia in [Cu(H2O)6]²⁺ to form [Cu(NH3)4(H2O)2]²⁺, write the balanced equation: [Cu(H2O)6]²⁺ + 4NH3 → [Cu(NH3)4]²⁺ + 2H2O.
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