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Salt Analysis
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Section:
Chemistry
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© examsnet.com
Question : 12 of 38
Marks:
+1
,
-0
Choose the correct tests with respective observations.
(A)
C
u
S
O
4
\mathrm{CuSO}_4
CuSO
4
(acidified with acetic acid) +
K
4
[
F
e
(
C
N
)
6
]
→
\mathrm{K}_4[\mathrm{Fe}(\mathrm{CN})_6] \rightarrow
K
4
[
Fe
(
CN
)
6
]
→
Chocolate brown precipitate.
(B)
F
e
C
l
3
+
K
4
[
F
e
(
C
N
)
6
]
→
\mathrm{FeCl}_3 + \mathrm{K}_4[\mathrm{Fe}(\mathrm{CN})_6] \rightarrow
FeCl
3
+
K
4
[
Fe
(
CN
)
6
]
→
Prussian blue precipitate.
(C)
Z
n
C
l
2
+
K
4
[
F
e
(
C
N
)
6
]
\mathrm{ZnCl}_2 + \mathrm{K}_4[\mathrm{Fe}(\mathrm{CN})_6]
ZnCl
2
+
K
4
[
Fe
(
CN
)
6
]
, neutralised with
N
H
4
O
H
\mathrm{NH}_4\mathrm{OH}
NH
4
OH
→
\rightarrow
→
White or bluish white precipitate.
(D)
M
g
C
l
2
+
K
4
[
F
e
(
C
N
)
6
]
→
\mathrm{MgCl}_2 + \mathrm{K}_4[\mathrm{Fe}(\mathrm{CN})_6] \rightarrow
MgCl
2
+
K
4
[
Fe
(
CN
)
6
]
→
Blue precipitate.
(E)
B
a
C
l
2
+
K
4
[
F
e
(
C
N
)
6
]
\mathrm{BaCl}_2 + \mathrm{K}_4[\mathrm{Fe}(\mathrm{CN})_6]
BaCl
2
+
K
4
[
Fe
(
CN
)
6
]
, neutralised with
N
a
O
H
→
\mathrm{NaOH} \rightarrow
NaOH
→
White precipitate.
Choose the correct answer from the options given below:
[2 Apr 2025 Shift 1]
A, D and E only
B, D and E only
C, D and E only
A, B and C only
Validate
Solution:
C
u
2
+
+
K
4
[
F
e
(
C
N
)
6
]
→
C
u
2
[
F
e
(
C
N
)
6
]
↓
Chocolate Brown ppt
\; \mathrm{Cu}^{2+} + \mathrm{K}_4[\mathrm{Fe}(\mathrm{CN})_6] \rightarrow \; \underset{\; \text{Chocolate Brown ppt} \;}{\mathrm{Cu}_2[\mathrm{Fe}(\mathrm{CN})_6] \downarrow}
Cu
2
+
+
K
4
[
Fe
(
CN
)
6
]
→
Chocolate Brown ppt
Cu
2
[
Fe
(
CN
)
6
]
↓
F
e
3
+
+
K
4
[
F
e
(
C
N
)
6
]
→
F
e
4
[
F
e
(
C
N
)
6
]
3
Prussian blue ppt
\; \mathrm{Fe}^{3+} + \mathrm{K}_4[\mathrm{Fe}(\mathrm{CN})_6] \rightarrow \; \underset{\; \text{Prussian blue ppt} \;}{\mathrm{Fe}_4[\mathrm{Fe}(\mathrm{CN})_6]_3}
Fe
3
+
+
K
4
[
Fe
(
CN
)
6
]
→
Prussian blue ppt
Fe
4
[
Fe
(
CN
)
6
]
3
Z
n
2
+
+
k
4
[
F
e
(
C
N
)
6
]
→
K
2
Z
n
3
[
F
e
(
C
N
)
6
]
2
White ppt
\; \mathrm{Zn}^{2+} + \mathrm{k}_4[\mathrm{Fe}(\mathrm{CN})_6] \rightarrow \; \underset{\; \text{White ppt} \;}{\mathrm{K}_2\mathrm{Zn}_3[\mathrm{Fe}(\mathrm{CN})_6]_2}
Zn
2
+
+
k
4
[
Fe
(
CN
)
6
]
→
White ppt
K
2
Zn
3
[
Fe
(
CN
)
6
]
2
A
,
B
,
C
A, B, C
A
,
B
,
C
are correct
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