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Question
Chemistry
A blue colouration is not obtained when
Q. A blue colouration is not obtained when
3586
239
AIPMT
AIPMT 1989
The d-and f-Block Elements
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A
ammonium hydroxide dissolves in copper sulphate
B
copper sulphate solution reacts with K
4
[Fe(CN)
6
]
C
ferric chloride reacts with sod. ferrocyanide
D
anhydrous CuSO
4
is dissolved in water
Solution:
C
u
S
O
4
+
K
4
[
F
e
(
CN
)
6
]
→
No reaction
4
N
H
4
O
H
+
C
u
S
O
4
→
Deep blue colour
[
C
u
(
N
H
3
)
4
]
S
O
4
+
4
H
2
O
Anhydrous
C
u
S
O
4
+
5
H
2
O
→
Blue colour
C
u
S
O
4
.5
H
2
O
4
F
e
C
l
3
+
3
N
a
4
[
F
e
(
CN
)
6
]
→
Ferric ferrocyanide (Prussian blue)
F
e
4
[
F
e
(
CN
)
6
]
+
12
N
a
Cl