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Chemistry
For the given aqueous reaction which of the statcment(s) is (are) true? Excess KI + K3[Fe(CN)6 xrightarrow textDilute H2SO4 <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/ee470482cc14eb729a84bac7e5deb7b1-.png />
Q. For the given aqueous reaction which of the statcment(s) is (are) true?
Excess
K
I
+
K
3
[
F
e
(
CN
)
6
Dilute
H
2
S
O
4
4080
219
IIT JEE
IIT JEE 2012
Organic Chemistry – Some Basic Principles and Techniques
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A
The first reaction is a redox reaction
13%
B
White precipitate is
Z
n
3
[
F
e
(
CN
)
6
]
2
37%
C
Addition of filtrate to starch solution gives blue colour
33%
D
White precipitate is soluble in
N
a
O
H
solution
17%
Solution:
K
3
[
F
e
+
3
(
CN
)
6
]
+
K
I
(
excess
)
⟶
K
4
[
F
e
+
2
(
CN
)
6
]
+
Brownish yellow solution
K
I
3
(redox)
K
4
[
F
e
(
CN
)
6
]
+
Z
n
S
O
4
⟶
K
2
Z
n
3
[
F
e
(
CN
)
6
]
2
or
White ppt
K
2
Z
n
[
F
e
(
CN
)
6
]
Brownish yellow filtrate
I
3
−
+
2
N
a
2
S
2
O
3
⟶
Clear solution
N
a
2
S
4
O
6
+
2
N
a
l
+
(Turns starch solution blue)
I
2
K
2
Z
n
[
F
e
(
CN
)
6
]
reacts with
N
a
O
H
as
K
2
Z
n
[
F
e
(
CN
)
6
]
+
N
a
O
H
⟶
[
Z
n
(
O
H
)
4
]
2
−
+
[
F
e
(
CN
)
6
]
4
−
