In the detection test of nitrogen,the Prussia | vedclass

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Question

(A) In the Lassaigne's test for nitrogen,the sodium fusion extract containing sodium cyanide $(NaCN)$ is treated with ferrous sulphate $(FeSO_{4})$. T

Vedclass · Accepted Answer

$Fe_{4}[Fe(CN)_{6}]_{3}$

Vedclass · Answer

(A) In the Lassaigne's test for nitrogen,the sodium fusion extract containing sodium cyanide $(NaCN)$ is treated with ferrous sulphate $(FeSO_{4})$. This leads to the formation of sodium ferrocyanide,$Na_{4}[Fe(CN)_{6}]$. On further reaction with ferric chloride $(FeCl_{3})$,it forms ferric ferrocyanide,which is known as Prussian blue. The chemical formula is $Fe_{4}[Fe(CN)_{6}]_{3} \cdot x H_{2}O$. This compound is chemically known as Iron$(III)$ hexacyanoferrate$(II)$.

In the detection test of nitrogen,the Prussian blue colour is due to which compound?

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