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During the test of N in an organic compo...

During the test of N in an organic compound by Lassaigne's extract, prussian blue colour is obtained. This is due to :

A

`Fe_(4)[Fe(CN)_(6)]_(3)`.`xH_(2)O`

B

`[Fe(CN)_(5)NOS]^(4-)`

C

`[Fe(SCN)_(2)]^(+)`

D

`[Fe(SCN)]^(2+)`

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The correct Answer is:
A
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