To determine the hybridization of d-block elements like Fe in Fe(CN)2, one must consider crystal field theory, a fundamental aspect of inorganic chemistry. This theory explains how the presence of ligands, such as cyanide in this case, influences the energy levels of d-orbitals. The discussion highlights the importance of understanding ligand field theory, which builds on crystal field theory by incorporating molecular orbital theory. To find the hybridization, standard protocols from chemistry texts should be applied, and specific questions can be addressed for clarity. The inquiry into Fe(CN)2 illustrates the complexities involved in hybridization and bonding in transition metal complexes.