Question

Among the following complex compounds–K3Fe(CN)6[Co(NH3)6]Cl3(ii) K2Pt(CN)4Zn(H2O)62(iv)diamagnetic complexes are –

• A. (A) (i), (ii) and (iii)
• B. (B) (ii) and (iii)
• C. (C) (i) and (iv)
• D. (D) (ii), (iii) and (iv)

Answer 1

Answer: (D)

(D) (ii), (iii) and (iv)

Answer 2

Explanation:
K3[Fe(CN)6]Fe+3 has 3d5 configuration, CN− is strong field ligand and thus Fe+3 has four electron paired leaving one unpaired electron with d2sp3 hybridization and thus paramagnetic.(ii) [Co(NH3)6]Cl3Co3+ has 3d6 configuration, NH3 is strong field ligands thus all six electrons are paired with d2sp3 hybridization and therefore diamagnetic.(iii) K2[Pt(CN)4]Pt+2 has 3d8 configuration, CN− is strong field ligand and thus all the eight electrons are paired with dsp2 hybridization and therefore diamagnetic.(iv) Zn(H2O)62Zn+2 has 3d10 configuration and thus all paired, showing sp3d2 hybridization and so diamagnetic.