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Question
Chemistry
Among the electrolytes Na2SO4, CaCl2, Al2(SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is
Q. Among the electrolytes
N
a
2
S
O
4
,
C
a
C
l
2
,
A
l
2
(
S
O
4
)
3
and
N
H
4
Cl
, the most effective coagulating agent for
S
b
2
S
3
sol is
4155
165
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A
N
a
2
S
O
4
9%
B
C
a
C
l
2
10%
C
A
l
2
(
S
O
4
)
3
74%
D
N
H
4
Cl
8%
Solution:
S
b
2
S
3
is a negative (anionic) sol. According to Hardy Schulze rule, greater the valency of cationic coagulating agent, higher its coagulating power. Therefore,
A
l
2
(
S
O
4
)
3
will be the most effective coagulating agent in the present case.