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IIT JEE Advanced 2006 Paper 1
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© examsnet.com
Question : 50
Total: 120
C
u
S
O
4
decolourises on addition of KCN, the product is
[
C
u
(
C
N
)
4
]
2
−
[
C
u
2
+
]
get reduced to from
[
C
u
(
C
N
)
4
]
3
−
C
u
(
C
N
)
2
CuCN
Validate
Solution:
CuSO4 reaction with KCN gives a white ppt of Cuprous Cyanide (CuCN) and cyanogens gas.
The cuprous cyanide dissolves in excess KCN forming
K
3
[
C
u
(
C
N
)
4
]
C
u
S
O
4
+
2
K
C
N
→
K
2
S
O
4
+
C
u
(
C
N
)
2
2
C
u
(
C
N
)
2
→
2
C
u
C
N
+
(
C
N
)
2
(cuprous cyanide) (cyanogens gas)
C
u
C
N
+
3
KCN
→
K
3
[
C
u
(
C
N
)
4
]
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