Explain ionization isomers with suitable example in complexes.
Q.9 Explain ionization isomers with suitable example in complexes.
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Answer: Ionization isomers have the same formula but give different ions in solution because a ligand and a counter ion exchange places.
When a counter ion can itself act as a ligand, it may be inside or outside the coordination sphere. The two compounds have the same composition but give different ions in solution.
Example: [Co(NH3)5SO4]Br (red violet) and [Co(NH3)5Br]SO4 (red).
The first gives Br− ions in solution (pale yellow ppt with AgNO3), the second gives SO42− ions (white ppt of BaSO4 with BaCl2).
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· 28 Oct 2026
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