A colloidal solution is subjected to an electric field than colloidal particles more towards anode. The amount of electrolytes of BaCl ₂, AlCl ₃ and NaCl required to coagulate the given colloid is in the order

Step-by-step solution

The amount of electrolyte required to coagulate the given colloid is in order NaCl > BaCl ₂ < AlCl ₃ Because as colloids move towards anode they must be negatively charge. According to Hardy Schulze rule, Coagulation value 1 Coagulating power (Charge an electrolyte) The charge on the electrolyte; Na ⁺, Ba ²⁺ and Al ³⁺ are 1,2 and 3 respectively.