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Question

What type of structural isomers are [Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br? Give a chemical test to distinguish the isomers?

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Solution

[CO(NH3)5Br]SO4 and [CO(NH3)5SO4]Br are ionisation isomers.
Aqueous solution of [CO(NH3)5Br]SO4 will give a white ppt whit BaCl2 solution. The ppt with BaCl2 solution. The ppt is insoluble in conc. HNO3 confirming presence of free SO24 ion. Aqueous solution of [CO(NH3)5SO4]Br will not give this test.
[CO(NH3)5Br]SO4[CO(NH3)5Br]2++SO24
BaCl2+SO24BaSO4white ppt+2Cl
[CO(NH3)5SO4]Br[CO(NH3)5SO4]++Br
BaCl2+BrNo ppt

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