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FeSO4 solution mixed with (NH4)2SO4 solu...

`FeSO_4` solution mixed with `(NH_4)_2SO_4` solution in 1:1 molar ratio gives the test of `Fe^(2+)` ion but CuS04 solution mixed with aqueous ammonia in 1:4 molar ratio does not give the test of `Cu^(2+)` ion. Explain why?

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FeSO_4 solution mixed with (NH_4)_2SO_4 solution in 1:1 molar ratio gives the test of Fe^(2+) 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 ?

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