Does aqua $(H_{2} O)$ come under strong field ligand or weak field ligand according To VBT Theory?

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Solution

Spectrochemical series: Spectrochemical series is the arrangement of ligands in the decreasing order of the strength of ligands.
Weak field ligands: Weak field ligands are those ligands that can not pair the valence electrons of a metal ion.
Normally, Aqua $(H_{2} O)$ is considered a weak field ligand. But in the case of the metal ion having an oxidation state $+ 3$ or higher than $+ 3$ and transition metals of 4d and 5d series, $H_{2} O$ acts as a strong ligand.

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Does aqua (H2O) come under strong field ligand or weak field ligand according To VBT Theory?

Does aqua $(H_{2} O)$ come under strong field ligand or weak field ligand according To VBT Theory?