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VITEEE 2011 Solved Paper
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© examsnet.com
Question : 60
Total: 120
Assertion (A)
C
u
2
+
and
C
d
2
+
are separated by first adding KCN solution and then passing
H
2
S
gas.
Reason (R)
KCN reduces
C
u
2
+
to
C
u
+
and forms a complex with it. The correct answer is
Both (A) and (R) are true and (R) is the correct explanation of (A)
Both (A) and (R) are true but (R) is not the correct explanation of (A)
(A) is true but (R) is not true
(A) is not true but (R) is true
Validate
Solution:
KCN forms complex with
C
u
+
and
C
d
2
+
as
K
3
[
C
u
(
C
N
)
4
]
and
K
2
[
C
d
(
C
N
)
4
]
respectively. On passing
H
2
S
, only
C
d
2
+
complex gets decomposed to yellow CDS.
© examsnet.com
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