The denticity of ethylenediaminetetraacetate ion ligand is:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Six
The denticity of a ligand is the number of donor atoms through which it binds to the central metal ion: one for a unidentate ligand such as \( \ce{NH3} \), two for a didentate ligand such as ethane-1,2-diamine. For EDTA4− (ethylenediaminetetraacetate):
\( \displaystyle \text{Denticity}=2\ (\text{N})+4\ (\text{O})=6 \)
So EDTA is a hexadentate ligand.
NCERT (2026-27 edition):
Definitions of Some Important Terms Pertaining to Coordination Compounds – …
Note: The same/similar question has been asked in different years by NTA as per the details given below:
| 2026 | 2025 | 2024 | 2023 | 2022 |
|---|---|---|---|---|
| 21-05 S2 18-05 S2 12-05 S2 | – | – | – | – |