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AP EAMCET Engineering 2013 Solved Paper
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© examsnet.com
Question : 69
Total: 160
Which one of the following gives Prussian blue colour?
F
e
2
[
F
e
(
C
N
)
6
]
N
a
4
[
F
e
(
C
N
)
6
]
F
e
3
[
F
e
(
C
N
)
6
]
3
F
e
4
[
F
e
(
C
N
)
6
]
3
Validate
Solution:
Ferric salts (such as
F
e
C
l
3
) form Prussian blue (blue ppt or colouration) with potassium ferrocyanide.
4
F
e
C
l
3
+
3
K
4
[
F
e
(
C
N
)
6
]
→
F
e
4
[
F
e
(
C
N
)
6
]
3
Prussian blue (ferric ferrocyanide)
+
12
K
C
l
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