Answer: It forms 1:1 stable complexes with metal ions at controlled pH, allowing accurate quantification.
- A It forms 1:1 stable complexes with metal ions at controlled pH, allowing accurate quantification
- B It functions generally as a strong acid that lowers the solution's pH as frequently observed in practice
- C It precipitates the target metal ions as an insoluble solid in many documented cases according to conventional understanding
- D It acts mainly as a visual indicator that changes colour at the endpoint in routine practice
Correct answer: A. It forms 1:1 stable complexes with metal ions at controlled pH, allowing accurate quantification
Explanation: EDTA complexometric titration: EDTA forms stable 1:1 complexes with most metal ions; endpoint is detected by metallochromic indicators (e.g., Eriochrome Black T).
The three common coordination geometries: octahedral (6 ligands), tetrahedral (4 ligands), and square planar (4 ligands in one plane).
Concept context
Study of compounds where a central metal atom is bonded to surrounding ligands. Covers nomenclature, types of isomerism, bonding theories (VBT, CFT), and applications in medicine, photography, and industry.