question_answer 25)

Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory? (i) Fe(CN)6]4–                                     (ii)[FeF6]3– (iii) [Co(C2O4)3]3–                             (iv) [CoF6]3–

Answer:

(i) See answer to Q.25?SATQ of CBSE examination questions. (ii) In [FeF6]3?, F? is a weak ligand and cannot cause pairing in Fe3+. So the other nd orbitals are involved in hybridization (sp3d2). The complex has octahedral geometry. It is paramagnetic in nature due to the presence of five unpaired electrons.                Octahedral structure of [FeF6]3? (iii) Try yourself (iv) See answer to Q. 49 of Additional Important questions.