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Explain why an aqueous solution of potassium hexacyanoferrate (II) does not give the test for ferrous ion.

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Aqueous solution of `K_(4)[Fe(CN)_(6)]` ionizes as :
`K_(4)[Fe(CN)_(6)]hArr4K^(+)+[Fe(CN)_(6)]^(4-)`
`Fe^(2+)` ion is not in free state, hence it does not given the test of `Fe^(2+)` ion.
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p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue. Treatment of aqueous solution of Y with reagent potassium hexacyanoferrate (II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, the treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown colouration due to the formation of Z. Q. Compound X is

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p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue. Treatment of aqueous solution of Y with reagent potassium hexacyanoferrate (II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, the treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown colouration due to the formation of Z. Q. Compound Z is

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