Q. The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is not correct?
A) Coagulation in both sols can be brought about by electrophoresis
B) Mixing the sols has no effect
C) Sodium sulphate solution causes coagulation in both sols
D) Magnesium chloride solution coagulates the gold sol more readily than the iron (III) hydroxide sol
Explanation
(c)
Mixing the soles together can cause coagulation since the charges are neutralised.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.