1.

Which of the following reactions occur during the detection of nitrogen in organic substancesby Lassaigne's test

Answer»

`Na + C + N rarr CaCN`
`FeSO_(4)+6NaCNrarrNa_(4)[Fe(CN)_(6)]+Na_(2)SO_(4)`
`3Na_(4)[Fe(CN)_(6)]+2FE(SO_(4))_(3)rarrFe_(4)[Fe(CN)_(6)]_(3) + 6Na_(2)SO_(4)`
None of these

Solution :The various reactions taking placein LASSAIGNE's test fornitrogen are
`Na + C + N rarrNaCN`
`FeSO_(4) +6NaCNrarr N_(4)[Fe(CN)_(6)] +Na_(2)SO_(4)`
`3Na_(4) [Fe(CN)_(6) ] +2Fe_(2) (SO_(4))_(3) rarr underset(" Prussion blue colour") (Fe_(4)[Fe(CN)_(6)]_(3)) +6Na_(2)SO_(4)`


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