Surface ChemistryHard

Question

A colloidal solution of arsenious sulphide is most readily coagulated by the addition of a normal solution?

Options

A.NaCl
B.CaCl2
C.Na3PO4
D.Al2(SO4)3

Solution

Arsenious sulphide is negatively charged sol so more the charge on cation of electrolyte, more the efficiency of electrolyte for coagulation.

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