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Weak field ligands like $H_2O$, $F^-$, and $Cl^-$ can act as strong ligands when bound to small, highly charged metal ions (e.g., $Cr^{3+}$, $Co^{3+}$, $Pt^{4+}$) or in environments that enhance orbital overlap. Ligand strength depends on the metal ion and bonding conditions.
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