Question

Select the correct statement ;

• A. Potassium ferrocyanide and potassium ferricyanide can be differentiated by measuring the solid state magnetic moment.
• B. The complex [Co(NH3)5Br]SO4 and [Co(NH3)5 SO4]Br can be differentiated by adding aqueous solution of barium chloride
• C. The complex [Co(NH3)5Cl]Br and [Co(NH3)5Br]Cl can be differentiated by adding aqueous solution of silver nitrate.
• D. All of these

Answer 1

Answer: (D)

All of these

Answer 2

(1) K4[Fe(CN)6] ; 3d6 ,

CN– is strong field ligand and thus compels for the pairing of electrons.

K3 [Fe(CN)6] ; 3d5 ,

CN– is strong field ligand and thus compels for the pairing of electrons.

(2) SO42– (aq) + Ba2+ (aq) $\longrightarrow$ BaSO4Æ (white); Br– (aq) + Ba2+ (aq) $\longrightarrow$no visible change.

(3) Cl– (aq) + Ag+ (aq) $\longrightarrow$ AgClÆ (white); Br– (aq) + Ag+ (aq) $\longrightarrow$ AgBrÆ (pale yellow)