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KCET 2015 Chemistry Solved Paper
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© examsnet.com
Question : 57
Total: 60
In presence of
H
C
l
,
H
2
S
results the precipitation of Group-2 elements but not Gp-4 elements during qualitative analysis. It is due to
higher concentration of
S
2
−
higher concentration of
H
+
lower concentration of
S
2
−
lower concentration of
H
+
Validate
Solution:
Dissociation of
H
2
S
is suppressed in presence of HCl due to common ion effect. This decreases the
S
2
−
ion concentration and hence, only Group II radicals having low solubility product are precipitated.
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