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IIT JEE Advanced 2011 Paper 2
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Question : 24
Total: 60
Passing
H
2
S
gas into a mixture of
M
n
2
+
,
N
i
2
+
,
C
u
2
+
and
H
g
2
+
ions in an acidified aqueous solution precipitates
CuS and HgS
MnS and CuS
MnS and NiS
NiS and HgS
Validate
Solution:
C
u
2
+
and
H
g
2
+
ions belong to Group II of inorganic salt analysis and their sulphides are very less soluble in aqueous medium.
Hence, CuS and HgS will be precipitated out even in acidic medium by passing
H
2
S
gas.
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