Comprehension \( \quad: \) The following passage describes characteristics of colloids. Answer t...

Comprehension \( \quad: \) The following passage describes characteristics of colloids. Answer the questions at the end of it. Lyophilic colloidal sols are much more stable than lyophobic colloidal sols. This is due to the extensive solvation of lyophilic colloidal sols, which forms a protective layer outside it and thus prevents it from forming associated colloids. Lyophilic colloidal sols also protect lyophobic colloidal sols from precipitation by the action of electrolytes. This is due to the formation of a protective layer by lyophilic sols outside lyophobic sols. Lyophilic colloidal sols are called protective sols. Gelatin (lyophilic) protects gold sol (lyophobic) from coagulation on the addition of sodium chloride solution. Protective powers of different colloidal sols are measured in terms of gold number (Zsigmondy). It is defined as the amount of protective sol in milligrams that prevents the coagulation of \( 10 \mathrm{~mL} \) of a given gold sol on adding \( 1 \mathrm{~mL} \) of 10 percent solution of sodium chloride. Thus, smaller the gold number of a lyophilic sol, the greater is the protective power.
\( [\mathrm{AgI}] \mathrm{I}^{-} \)colloidal sol can be coagulated by the addition of a suitable cation. \( 1 \mathrm{~mol} \) of \( [\mathrm{AgI}] \mathrm{I}^{-} \)requires \( \mathrm{mol} \) of \( \mathrm{AgNO}_{3}, \mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{2} \) and \( \mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{3} \).
(a) \( 1,1,1 \)
(b) 1, 2, 3
(c) \( 1, \frac{1}{2}, \frac{1}{3} \)
(d) \( 6,3,2 \)