Collidal dispersion have been classified into different types depending upon the physical state of the dispersed phases 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 will have maximum flocculation value for aresnic sulphide sol?

Options

A. `BaCl_(2)`
B. `NaCl`
C. `KCl`
D. `AlCl_(3)`

Answer

B

Explanation

`Ag_(2)S_(3)` is a negative sol Less is the valency of the positive ion, greater is the flocculation value (i.e., greater is the amount of the electrolyte required to be added for coagulation) out of `Na^(o+)` and `K^(o+)` ions. `Na^(o+)` ions have greater flocculation value `(52)` than `K^(o+)(49.5)` .