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In the Lassaigne’s test for nitrogen in ...

In the Lassaigne’s test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of:
(a) `Na_(4)[Fe(CN)_(6)]` (b) `Fe_(4)[Fe(CN)_(6)]_(3)` (c) `Fe_(2)[Fe(CN)_(6)]` (d) `Fe_(3)[Fe(CN)_(6)]_(4)`

A

`Na_4[Fe(CN)_6]`

B

`Fe_4[Fe(CN)_6]_3`

C

`Fe[Fe(CN)_6]`

D

`Fe[Fe(CN)_6]_6`

Text Solution

Verified by Experts

The correct Answer is:
B
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K_(3)[Fe(CN)_(6)]+FeCl_(3) to Fe[Fe(CN)_(6)]darr

K_(4)[Fe(CN)_(6)]+ZnSO_(4) to Zn_(2)[Fe(CN)_(6)]darr

K_(4)[Fe(CN)_(6)]+2CuSO_(4)toCu_(2)[Fe(CN)_(6)]darr

K_(3)[Fe(CN)_(6)]+FeCl_(2) to Fe_(3)[Fe(CN)_(6)]_(2)darr

4KCN+Fe(CN)_(2)darr to K_(4)[Fe(CN)_(6)]

O.N of Fe in K_(4)[Fe(CN)_(6)] is

Fe(CN)_(2)darr+KCN to K_(3)Fe(CN)_(6)

Fe(CN)_(2)darr+4KCN to K_(4)[Fe(CN)_(6)]

Fe(CN)_(2)darr+4KCN to K_(4)[Fe(CN)_(6)]

3KCN+Fe(CN)_(3)darr to K_(3)[Fe(CN)_(6)]

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