The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

(a) Fe4[Fe(CN)6]

(b) Na3[Fe(CN)6]

(c) Fe(CN)3 

(d) Na4 [Fe(CN)5NOS.

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1 Answers

(a) : 3Na4[Fe(CN)6] + 4Fe3+  → Fe4 [Fe(CN)6]3 + 12Na+
 Prussian blue

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