Which of the following will not give the chemical tast for iron in aqueous solution ?

Options

A. `K_(2)Fe_(2)SO_(4).24H_(2)O`
B. `(NH_(4))_(2)SO_(4).FeSO_(4).6H_(2)O`
C. `K_(3)[FeF_(6)]`
D. `Fe_(4)[Fe(CN)_(6)]_(3)`.

Answer

C

Explanation

`K_(3)[FeF_(6)]hArr3K^(+)+[FeF_(6)]^(3-)`
It will not give any `Fe^(3+)` ions in solution (A) and (B) are double salts and will give all the ions present on ionisation.
`Fe_(4)[Fe(CN)_(6)]_(3)hArrFe^(3+) + 4[Fe(CN)_(6)]`