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

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The compound formed in the positive test for neitrogen with Lassaigne solution of an organic compound
A. `Na_(4)[Fe(CN)_(5)NOS]`
B. `Na_(3)[Fe(CN)_(6)]`
C. `Fe(CN)_(6)]`
D. `Fe_(4)[Fe(CN)_(6)]_(3)`
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Correct Answer - D
`NaCN overset(FeSO_(4))rarr Na_(4) [Fe(CN)_(6)]overset(Fe^(3+))rarr underset((blue))(Fe_4[Fe(CN)_6]_3)`
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