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K(2)SO(4) solution mixed with Cr(2)(SO(4...

`K_(2)SO_(4)` solution mixed with `Cr_(2)(SO_(4))_(3)` solution in 1:1 molar ratio gives the test of `Cr^(3+)` ion but `CuSO_(4)` solution mixed with aqueous ammonia in 1:4 molar ratio does not give the test of `Cu^(2+)` ion. Explain why ?

Text Solution

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`K_(2)SO_(4).Cr_(2)(SO_(4))_(3) overset(aq)iff2K^(+)(aq)+2Cr^(3+)(aq)+4SO_(4)^(2-)`
So chrome alum is double salt. It when dissolved in water gives its constituent ions. Hence it gives the test of `K^(+),Cr^(3+) and SO_(4)^(2-)` ions.
`CuSO_(4).4NH_(3)[Cu(NH_(3))_(4)SO_(4) overset(aq)iff[Cu(NH_(3))_(4)]^(2+)(aq)+SO_(4)^(2-)(aq)`
As copper (II) is present in coordination sphere it will not given the test of `Cu^(2+)` ion.
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