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MHT CET 202625 AprilMorning Shift
Exam
MHT CET
Year
2026
Date
25 April
Shift
Morning Shift
Subject
Chemistry
Chapter
Coordination Compounds

MHT CET 2026 · 25 April · Morning Shift · Chemistry · Coordination Compounds

Which of the following complexes exhibits solvate isomerism?

Which of the following complexes exhibits solvate isomerism?

Options

  1. A[Co(NH3)6] [Cr(CN)6][\text{Co(NH}_3)_6]\ [\text{Cr(CN)}_6] and [Cr(NH3)6] [Co(CN)6][\text{Cr(NH}_3)_6]\ [\text{Co(CN)}_6]
  2. B[Cr(H2O)6]Cl3[\text{Cr(H}_2\text{O)}_6]\text{Cl}_3 and [Cr(H2O)5Cl]Cl2⋅H2O[\text{Cr(H}_2\text{O)}_5\text{Cl}]\text{Cl}_2 \cdot \text{H}_2\text{O}
  3. C[Co(NH3)5Br]SO4[\text{Co(NH}_3)_5\text{Br}]\text{SO}_4 and [Co(NH3)5 SO4]Br[\text{Co(NH}_3)_5\ \text{SO}_4]\text{Br}
  4. D[Co(NH3)5(NO2)]2+[\text{Co(NH}_3)_5(\text{NO}_2)]^{2+} and [Co(NH3)5(ONO)]2+[\text{Co(NH}_3)_5(\text{ONO})]^{2+}

Correct answer

B. [Cr(H2O)6]Cl3[\text{Cr(H}_2\text{O)}_6]\text{Cl}_3 and [Cr(H2O)5Cl]Cl2⋅H2O[\text{Cr(H}_2\text{O)}_5\text{Cl}]\text{Cl}_2 \cdot \text{H}_2\text{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(H2O)6]Cl3[\text{Cr(H}_2\text{O)}_6]\text{Cl}_3 and [Cr(H2O)5Cl]Cl2⋅H2O[\text{Cr(H}_2\text{O)}_5\text{Cl}]\text{Cl}_2 \cdot \text{H}_2\text{O}, the number of water molecules inside and outside the coordination sphere is different. Thus, they exhibit solvate isomerism.

[Co(NH3)6] [Cr(CN)6][\text{Co(NH}_3)_6]\ [\text{Cr(CN)}_6] and [Cr(NH3)6] [Co(CN)6][\text{Cr(NH}_3)_6]\ [\text{Co(CN)}_6] exhibit coordination isomerism.

[Co(NH3)5Br]SO4[\text{Co(NH}_3)_5\text{Br}]\text{SO}_4 and [Co(NH3)5 SO4]Br[\text{Co(NH}_3)_5\ \text{SO}_4]\text{Br} exhibit ionization isomerism.

[Co(NH3)5(NO2)]2+[\text{Co(NH}_3)_5(\text{NO}_2)]^{2+} and [Co(NH3)5(ONO)]2+[\text{Co(NH}_3)_5(\text{ONO})]^{2+} exhibit linkage isomerism.

Answer: [Cr(H2O)6]Cl3[\text{Cr(H}_2\text{O)}_6]\text{Cl}_3 and [Cr(H2O)5Cl]Cl2⋅H2O[\text{Cr(H}_2\text{O)}_5\text{Cl}]\text{Cl}_2 \cdot \text{H}_2\text{O}
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