That depends like CN- has -1 and NH3 and H2O has 0 and NO has 0 and +1 depends on the lingand in the comund

Oxidation Numbers of Ligands in a Coordination Compound:

Definition:
Ligands are molecules or ions that bind to a central metal atom in a coordination compound. Each ligand donates a pair of electrons to the metal, forming a coordinate covalent bond.

Oxidation Numbers of Ligands:
- Ligands are considered to be neutral molecules or anions with a charge of -1.
- Since ligands donate a pair of electrons to the central metal atom, they are assigned an oxidation number of -1.
- This is because the ligands are electron donors and the metal atom is an electron acceptor.
- The oxidation number of the metal atom is determined by considering the total charge of the coordination complex.
- For example, in the complex [Co(NH3)6]Cl3, each NH3 ligand has an oxidation number of -1, while the Co atom has an oxidation number that balances the overall charge of the complex (in this case, +3 to balance the three Cl- ions).

Implications:
- Understanding the oxidation numbers of ligands is crucial in determining the overall charge and stability of a coordination compound.
- It also helps in predicting the reactivity and behavior of the complex in various chemical reactions.
By following these rules and principles, one can easily determine the oxidation numbers of ligands in a coordination compound.