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