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During Lassaigne's test for nitrogen, th...

During Lassaigne's test for nitrogen, the sodium fusion extract i9s heated to boiling with ferrous sulphate crystals and then acidified with dilute sulphuric acid. If `N` is present, Prussian blue appears due to the formation of

A

`NaCN`

B

`Na_(4)[Fe(CN)_(6)]`

C

`Fe(CN)_(2)`

D

`Fe_(4)[Fe(CN)_(6)]_(3)`

Text Solution

Verified by Experts

The correct Answer is:
D
Prussian blue color is due to the formation of ferri ferrocyanide which is formed according to the following reactions:
`Na + C + N rarr NaCN`
`2NaCN + FeSO_(4) rarr Fe(CN)_(2) + Na_(2)SO_(4)`
`Fe(CN_(2)) + 4NaCN rarr Na_(4)[Fe(CN)_(6)]`
`3Na_(4)[Fe(CN)_(6)] + 4Fe^(3+) rarr Fe_(4)[Fe(CN)_(6)] + 12Na^(+)`
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