Q.

For coagulation of arsenic sulphide sol, which one of the following salt solution will be most effective?

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a

AlCl3

b

NaCl

c

BaCl2

d

Na3PO4

answer is A.

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Detailed Solution

As arsenic sulphide sol is negatively charged, cations are effective in coagulation.Greater the charge on cation greater is its coagulation power.Hence,Al+3 ion is effective in coagulation
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