1.

The Prussium blue colour obtained in the Lassaigne's test forn nitrogen is due to the formulaof

Answer»

Iron (II) hexacyanoferrate (III)
Iron (III) hexacyanoferrate (II)
Iron (III) hexacyanoferrate (III)
Iron (II) hexacyanoferrate (II)

Solution :The chemistry of the Lassaigne's test of nitrogen is
`underset("compound")underset(" CROM organic")(Na+C+N)OVERSET(Delta)rarrNaCN`
`2NaCN + FeSO_(4)rarr Fe(CN)_(2) + Na_(2)SO_(4)`
`Fe(CN)_(2)+4NaCNrarrunderset(" Sod.FERROCYANIDE")(Na_(4)[Fe(CN)_(6)]`
`3Na_(4)[Fe(CN)_(6)]+4Fe_(3)^(+)rarr underset(" Porusian blue")underset(" Ferric ferrocyanide")(Fe_(4)[Fe(CN)_(6)]_(3)+12Na^(+))`


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