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FeSO(4) solution mixed with (NH(4))(2)SO...

`FeSO_(4)` solution mixed with `(NH_(4))_(2)SO_(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 ?

Text Solution

Verified by Experts

`FeSO_(4)` solution mixed with `(NH_(4))_(2)SO_(4)` solution forms a double salt, having the formula `FeSO_(4).(NH_(4))_(2)SO_(4).6H_(2)O` (Mohr salt) which ionises in the solution to give `Fe^(2+)` ions. Hence, it gives the tests of `Fe^(2+)` ions.
`CuSO_(4)` solution mixed with aqueous ammonia forms a complex salt, with the formula `[Cu(NH_(3))_(4)]SO_(4)`. The complex ion, `[Cu(NH_(3))_(4)]^(2+)` does not ionise to give `Cu^(2+)` ions. Hence, it does not give the tests of `Cu^(2+)` ion.
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FeSO_(4) solution mixed with (NH_(4))_(2)SO_(4) solution in 1 : 1 molar ratio gives the test of Fe^(2+) but CuSO_(4) solution mixed with aqueous ammonia in 1 : 4 molar ratio does not give the test of Cu^(2+) ion. Explain why ?

FeSO_4 solution mixed with (NH_4)_2SO_4 solution is 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?

Knowledge Check

  • KI and CuSO_4 solution when mixed give .

    A
    `Cu l_2 + K_2SO_4`
    B
    `Cu_2I_2 + K_2SO_4`
    C
    `K_2SO_4 + CU_2I_2 +I_2`
    D
    `K_2SO_4 + CuI_2I_2`
  • KI and CuSO_4 solutions when mixed give

    A
    `CuI_2+K_2SO_4`
    B
    `Cu_2I_2+K_2SO_4`
    C
    `K_2SO_4+Cu_2I_2+I_2`
    D
    `K_2SO_4+CuI_2+I_2`
  • Which of the following salt does not give test of Fe^(+2) ion in aq solution :-

    A
    `FeSO_4(NH_4)_2SO_(4)6H_2O`
    B
    `Fe_3[Fe(CN)_6]_2`
    C
    `Fe_4[Fe(CN)_6]_3`
    D
    (2) and (3)
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