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Sulphur

In Lassaignes...

Question

In Lassaignes test when both nitrogen and
sulphur is present, blood red colour obtained
is due to the formation of_______________.

A

ferric ferrocyanide

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B

ferric thiocyanate

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C

ferric cyanide

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D

sodium cyanide

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Solution

The correct option is C ferric thiocyanate
$N a + C + S Δ \to N a C N S$
$3 C N S + f e^{3 +} \to f e (C N S)_{3}$
Thiocynate ion ferric thiocynate
(Blood-red colour)

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