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FeSO4, solution mixed with (NH4)2SO4, so...

`FeSO_4`, solution mixed with `(NH_4)_2SO_4`, solution in 1:1 molar ratio gives the test for `Fe^(2+)` ion but `CuSO_4`, solution mixed with aqueous ammonia in1:4 molar ratio does not give the test for `Cu^(2+)` ion. Explain.

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USHA PUBLICATION-PREVIOUS YEAR QUESTION 2018-PREVIOUS YEAR QUESTION
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