Which of the following are chelating ligands?
`H_(2)O``C_(2)O_(4)^(2_)`,` EDTA^(4-)`, `CO_(3)^(2-)`,`SCN^(-)`, CO, `C_(2)H_(4)`

Explanation

To determine which of the given ligands are chelating ligands, we need to understand the definition of chelating ligands. Chelating ligands are polydentate ligands that can bind to a central metal atom at multiple points, forming a ring structure.

Let's analyze each of the given ligands step by step:

1. **H₂O (Water)**:
- Water has one donor atom (oxygen) that can coordinate to a metal ion.
- Since it can only donate one pair of electrons, it is classified as a **monodentate ligand**.
- **Conclusion**: Not a chelating ligand.
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