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Q.

Arsenic (III) sulphide forms a sol with a negative charge. Which of the following ionic substances should be most effective in coagulating the sol

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a

KCl

b

MgCl2

c

Al2(SO4)3

d

Na3PO4

answer is C.

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Detailed Solution

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  • To coagulate negative sol of As2​S3​, the coagulation power of different cations decrease in the order Al3+>Mg2+>K+>Na+
    hence, the flocculation value increases in the order Al3+<Mg2+<K+<Na+
    The flocculating values (in milli moles/litre) of Al3+>Mg2+>K+>Na+ are 0.093, 0.72, 50 and 51 respectively.
    Thus, Al2​(SO4​)3​ is the most effective in coagulating the sol.
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