Assertion : The magnitude of charge density for a given ligand increases as the charge on the metal

ion increases.

Reason : ${\mathrm{NH}}_{3}$ is a weak field ligand towards ${\mathrm{Co}}^{2+}$ but acts as a strong field ligand towards ${\mathrm{Co}}^{3+}.$

Concept Videos :-

#23 | VBT & CFT: I
#24 | VBT & CFT: II
#25 | VBT & CFT: III
#26 | Colour of Coordination Compounds

Concept Questions :-

VBT & CFT, Limitation /Hybridisation

(B) As metal ion charge increases the ligands are drawn closer to the metal ion because of its increased

charge density. As the ligands move closer, they cause greater splitting of the d-orbital, there by

producing a large $∆{\mathrm{t}}_{\mathbf{2}\mathbf{g}}$ value.

Difficulty Level:

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