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Q. Colloidal dispersion have been classified into different types depending upon the physical state of the dispersed phase and the dispersion medium. They are prepared in the industry or in the laboratory by a number of methods and then purified. The protective action of lyophilic colloids was studied by zsigmondy and he introduced a term called gold number
Which of the following does not form a lyophilic colloid?

Surface Chemistry

Solution:

$SnCl _2+ AuCl _3$ react to form gold sol which is a lyophobic sol