Sodium fusion extract, obtained from aniline, on treatment with iron (II) sulphate and $H_{2} {S O}_{4}$ , in presence of sir gives a Prussian blue precipitate. The blue colour is due to the formation of__________.

{F e}_{4} [{F e (C N)}_{6}]_{3}

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{F e}_{3} [{F e (C N)}_{6}]_{2}

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{F e}_{4} [{F e (C N)}_{6}]_{2}

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F e [{F e (C N)}_{6}]_{3}

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Solution

The correct option is A ${F e}_{4} [{F e (C N)}_{6}]_{3}$
Sodium fusion extract, obtained from anilinecontains NaCN.
On treatment with iron (II) sulphate and $H_{2} {S O}_{4}$ , in presence of air, a Prussian blue precipitate of ferric ferrocyanide
${F e}_{4} [{F e (C N)}_{6}]_{3}$ is obtained.

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H_{2} S O_{4}

In the Lassaigne’s test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of:

(a) Na₄[Fe(CN)₆] (b) Fe₄[Fe(CN)₆]₃ (c) Fe₂[Fe(CN)₆] (d) Fe₃[Fe(CN)₆]₄

{N H}_{2} - {N H}_{2}

{F e}_{4} {[F e ({C N}_{6})]}_{3}

F e {S o}_{4}, F e {C I}_{3}

K_{4} [F e (C N)_{6}]

F e C l_{3} (a q)

K_{4} [F e (C N)_{6}]

F e C l_{3}

K_{4} [F e (C N)_{6}]

F e_{4} [F e (C N)_{6}]

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