Question

Which of the following electrolytes will have maximum coagulating value for $\mathrm { AgI } / \mathrm { Ag } ^ { + }$ sol?

• A. (a) $\mathrm { Na } _ { 2 } \mathrm {~S}$
• A. (b) $\mathrm { Na } _ { 3 } \mathrm { PO } _ { 4 }$
• A. (c) $\mathrm { Na } _ { 2 } \mathrm { SO } _ { 4 }$
• A. (d) NaCl

Answer 1

(b)

Sol. $\mathrm { AgI } / \mathrm { Ag } ^ { + }$ is positive colloid, It will be coagulated easily by the anion with large negative charge i.e.,