Question

Using valence bond approach, deduce the shape and magnetic behaviour of the following
complexes
(i) [Ni(CO)4]
(ii) [Cr(H2O)2(C204)2]
(iii) [CoF6]^3-
(at,nos: Ni=28, Cr = 24. Co = 27)​

Answer 1

Valence bond theory can easily deduce the shape along with the magnetic behaviors of any given element or compound.

Explanation:

• [Ni(CO)4] will have a unique tetrahedral geometry since it has sp3 hybridization. It is diamagnetic in nature.

• [Cr(H2O)2(C204)2] has d2sp3 hybridization and tetrahedral geometry. It is diamagnetic as well.

• Meanwhile, [CoF6]^3- is paramagnetic and its hybridization is sp3d2. The shape of this compound is octahedral.