(A) The complex K4[Fe(CN6)] involves d2sp3 hybridization. It has octahedral geometry. Six electron are present in t2g orbital
E.A.N is 36.
(B) The complex K3[Fe(CN6)] involves d2sp3 hybridization. It has octahedral geometry.
(C) The complex Fe4[Fe(CN6)]3 has d2sp3 hybridization. It has octahedral geometry. It has blue color due to charge transfer.
Six electron are present in t2g orbital.
E.A.N is 36
(D) The complex [Co(NH3)6]3+ involves d2sp3 hybridization. It has octahedral geometry. Six electron are present in t2g orbital
E.A.N is 36.