1.

Which of the following reactions occur during the detection of nitorgen in organic substances by Lassaigne's test?

Answer»

`Na+C+NtoNaCN`
`FeSO_(4)+6NaCNtoNa_(4)[FE(CN)_(6)]+Na_(2)SO_(4)`
`Na_(4)[Fe(CN)_(6)]+2Fe_(2)(SO_(4))_(3)toFe_(4)[Fe(CN)_(6)]_(3)+6Na-(2)SO_(4)`
none of these

Solution :The various reactions TAKING place in Lassaigne's test for nitrogen are
`Na+C+NtoNaCN`
`FeSO_(4)+6NaCNtoNa_(4)[Fe(CN)_(6)]+Na_(2)SO_(4)`
`3Na_(4)[Fe(CN)_(6)]+2Fe_(2)(SO_(4))_(3)toFe_(4)[Fe(CN)_(6)]_(3)+6Na_(2)SO_(4)`
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