MHT CET Medical202625 April 2026Morning ShiftChemistryCoordination CompoundsActual
Which of the following complexes exhibits solvate isomerism?
Options
- A[ Co(NH ₃)₆] [ Cr(CN) ₆] and [ Cr(NH ₃)₆] [ Co(CN) ₆]
- B[ Cr(H ₂ O) ₆] Cl ₃ and [ Cr(H ₂ O) ₅ Cl ] Cl ₂ H ₂ O
- C[ Co(NH ₃)₅ Br ] SO ₄ and [ Co(NH ₃)₅ SO ₄] Br
- D[ Co(NH ₃)₅( NO ₂)]²⁺ and [ Co(NH ₃)₅( ONO )]²⁺
Correct answer
B. [ Cr(H ₂ O) ₆] Cl ₃ and [ Cr(H ₂ O) ₅ Cl ] Cl ₂ H ₂ O
Step-by-step solution
Solvate isomerism (or hydrate isomerism when water is the solvent) occurs when the solvent molecules are directly bonded to the metal ion or are present as free solvent molecules in the crystal lattice. In [ Cr(H ₂ O) ₆] Cl ₃ and [ Cr(H ₂ O) ₅ Cl ] Cl ₂ H ₂ O , the number of water molecules inside and outside the coordination sphere is different. Thus, they exhibit solvate isomerism. [ Co(NH ₃)₆] [ Cr(CN) ₆] and [ Cr(NH ₃)₆] [ Co(CN) ₆] exhibit coordination isomerism. [ Co(NH ₃)₅ Br ] SO ₄ and [ Co(NH ₃)₅ SO ₄] Br