Q. Select wrong statement.
A) If a very small amount of ${AlCl}_{3}$is added to gold sol, coagulation occurs, but if a large quantity of ${AlCl}_{3}$is added, there is no coagulation.
B) Organic ions are more strongly adsorbed on charged surfaces in comparison to inorganic ions.
C) Both emulsifier and peptising agents stabilise colloids but their actions are different.
D) Colloidal solutions are thermodynamically stable.
Explanation
(a)
The phenomenon of the precipitation of a colloidal solution by the addition of the excess of an electrolyte is called coagulation. When oppositely charged sols are mixed in almost equal proportions, their charges are neutralised. So, statement (a) is wrong.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.