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Question
Give evidence that [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl are ionization isomers.
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Solution
Ionization isomers dissolve in water to give different ions, hence giving different reactions with different reagents.
\[\ce{[Co(NH3)5Cl]SO4 + Ba^{2+} -> BaSO4_{(s)}}\]
\[\ce{[Co(NH3)5SO4]Cl + Ba^{2+} -> {No Reaction}}\]
\[\ce{[Co(NH3)5Cl]SO4 + Ag^+ -> {No Reaction}}\]
\[\ce{[Co(NH3)5SO4]Cl + Ag^+ -> AgCl_{(s)}}\]
Since the given complexes give different reactions with different reagents, hence they are ionization isomers.
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| Column I (Complex species) | Column II (Isomerism) |
| A. \[\ce{[Co(NH3)4 Cl2]^+}\] | 1. optical |
| B. \[\ce{cis-[Co(en)2 Cl2]^+}\] | 2. ionisation |
| C. \[\ce{[Co(NH3)5 (NO2)]Cl2}\] | 3. coordination |
| D. \[\ce{[Co(NH3)6][Cr(CN)6]}\] | 4. geometrical |
| 5. linkage |
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