Question

a) Write the IUPAC name of the complex K₃[Cr(C₂O₄)₃].

b) Draw the gure to show the splitting of ‘d’ orbitals in octahedral crystal eld. 

c) [Fe(H₂O₆)^3- ] is strongly paramagnetic, whereas [Fe(CN₆)]^3- is weakly paramagnetic. Write the reason.

Answer 1

a) Potassium trioxalatochromate(lll)

c) H₂O is a weaker ligand compared to CN. There is no pairing of electrons in the d-orbital of Fe in [Fe(H₂O)₆]³⁺. But there is the pairing of electrons in the d-orbital of Fe in [Fe(CN₆)]^3-.