Red coloured complex ion formed on adding $F e C l_{3}$ to sodium extract, when N and S both are present in the organic compound, is

[Fe(CN)₆]^-4

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[Fe(CNS)₆]⁺²

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[Fe(CNS)₂]⁺

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Fe₄[Fe(CNS)₆]₃

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Solution

The correct option is C
[Fe(CNS)₂]⁺

$F e C l_{3}$ $+ N a S C N$ $\to$ Ferricthiocynide $[F e (S C N)_{2}]^{+}$ (blood red colour)

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N and S

F e C l_{3}

N

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F e C l_{3}

N

S

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

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