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Question

The reaction of K3[Fe(CN)6] with freshly prepared FeSO4 solution produces a dark blue precipitate called Turnbull’s blue. Reaction of K4[Fe(CN)6] with the FeSO4 solution in complete absence of air produces a white precipitate X, which turns blue in air. Mixing the FeSO4 solution with NaNO3, followed by a slow addition of concentrated H2SO4 through the side of the test tube produces a brown ring.

Precipitate X is:

A
Fe4[Fe(CN)6]3
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B
Fe[Fe(CN)6]
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C
K2Fe[Fe(CN)6]
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D
KFe[Fe(CN)6]
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Solution

The correct option is C K2Fe[Fe(CN)6]
Potassium hexacyanoferrate(II) K4[Fe(CN)6]4 is a yellow coloured solid and can be made by the action of CN on an iron(II) saltin solution. Fe2+ ions give a white precipitate of K2Fe[Fe(CN)6].
FeSO4 + K4[Fe(CN)6]K2Fe[Fe(CN)6]While ppt.

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