Surface ChemistryHard

Question

The dispersed phase in colloidal iron(III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statement(s) is/are not correct?

Options

A.Magnesium chloride solution coagulates the gold sol more readily than the iron(III) hydroxide
B.Sodium sulphate solution causes coagulation in both sols.
C.Mixing of the sols has no e­ffect.
D.Coagulation in both sols can be brought about by electrophoresis.

Solution

Charge: Mg2+ (2 unit) > Cl– (1 unit).

Hence, better coagulation for negatively charged gold sol.

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