Isomerism

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Pair showing ionization isomerism among the following:

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1. **Ionization Isomerism**: Occurs when the composition of the coordination sphere ($[\dots]$) and the ionizable counter-ion are interchanged.
2. **Analysis**:
   - In $[Co(NH_3)_5Br]SO_4$, $SO_4^{2-}$ is the counter-ion and gives a precipitate with $BaCl_2$.
   - In $[Co(NH_3)_5SO_4]Br$, $Br^-$ is the counter-ion and gives a precipitate with $AgNO_3$.
3. **Other pairs**:
   - The $Cr$ pair represents **hydrate isomerism** (interchange of water).
   - The $Pt$ pair is the same molecule written differently.
   - The $Fe$ pair represents different oxidation states.

Isomerism

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