Surface ChemistryHard

Question

Among the electrolytes Na2SO4, CaCl2, Al2(SO4)3 and NH4Cl, the most e­ffective coagulating agent for Sb2S3 is

Options

A.Na2SO4
B.CaCl2
C.Al2(SO4)3
D.NH4Cl

Solution

Sulphide sol have negative charge on colloidal particles.

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