In the Lassaigne's test,the Prussian blue pre | vedclass

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(B) In the Lassaigne's test for nitrogen,the sodium fusion extract contains sodium cyanide $(NaCN)$.When this extract is treated with ferrous sulfate

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$Fe_4[Fe(CN)_6]_3$

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(B) In the Lassaigne's test for nitrogen,the sodium fusion extract contains sodium cyanide $(NaCN)$.When this extract is treated with ferrous sulfate $(FeSO_4)$,it forms sodium ferrocyanide: $6NaCN + FeSO_4 \rightarrow Na_4[Fe(CN)_6] + Na_2SO_4$.Upon further reaction with ferric ions $(Fe^{3+})$ formed by the oxidation of some $Fe^{2+}$ ions,ferric ferrocyanide is produced: $3Na_4[Fe(CN)_6] + 4Fe^{3+} \rightarrow Fe_4[Fe(CN)_6]_3 \cdot xH_2O$.This compound,$Fe_4[Fe(CN)_6]_3$,is known as Prussian blue,which gives the characteristic blue color.

In the Lassaigne's test,the Prussian blue precipitate is formed due to the formation of which compound?

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