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Question
Chemistry
Which one of the following gives Prussian blue colour?
Q. Which one of the following gives Prussian blue colour?
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A
F
e
2
[
F
e
(
CN
)
6
]
B
N
a
4
[
F
e
(
CN
)
6
]
C
F
e
3
[
F
e
(
CN
)
6
]
3
D
F
e
4
[
F
e
(
CN
)
6
]
3
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
(
CN
)
6
]
⟶
Prussian blue (ferric ferrocyanide)
F
e
4
[
F
e
(
CN
)
6
]
3
+
12
K
Cl