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 analyze each ligand based on its ability to form multiple bonds with a central metal atom, thus creating a ring structure. Chelating ligands are typically polydentate, meaning they can attach to a metal at multiple points.

Let's analyze each ligand:

1. **H₂O**:
- This is a monodentate ligand, as it can only donate one pair of electrons from the oxygen atom to the metal. Therefore, it does not form a ring structure.
- **Conclusion**: Not a chelating ligand.

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