The hybridization of the complexes can be determined by the number of ligands and their geometry. Here are the correct matches:
- Ni(CO)\(_4\): The complex is tetrahedral, hence sp\(^3\).
- [Ni(CN)\(_4\)]\(^{2-}\): The complex is square planar, requiring dsp\(^2\) hybridization.
- [Co(NH\(_3\))\(_6\)]\(^{3+}\): The complex is octahedral, so the hybridization is d\(^2\)sp\(^3\).
- [CoF\(_6\)]\(^{3-}\): The complex is octahedral, so sp\(^3\) hybridization.