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AIEEE 2004 Chemistry Solved Paper
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© examsnet.com
Question : 67
Total: 75
The compound formed in the positive test for nitrogen with the Lassaigne's solution of an organic compound is
Fe
4
[
Fe
(
CN
)
6
]
3
Na
4
[
Fe
(
CN
)
5
NOS
]
Fe
(
CN
)
3
Na
3
[
Fe
(
CN
)
6
]
Validate
Solution:
If nitrogen is present in organic compound, then sodium extract contains
NaCN
.
Na
+
C
+
N
Fuse
⟶
NaCN
FeSO
4
+
6
NaCN
→
Na
4
[
Fe
(
CN
)
6
]
+
Na
2
SO
4
Na
4
[
Fe
(
CN
)
6
]
changes to prussian blue
Fe
4
[
Fe
(
CN
)
6
]
3
on reaction with
FeCl
3
.
FeCl
3
+
Na
4
[
Fe
(
CN
)
6
]
→
Fe
4
[
Fe
(
CN
)
6
]
3
+
12
NaCl
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