Question
Chemistry Question on Colloids
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.
Answer
Mixing the sols has no effect
Explanation
Solution
Mixing the soles together can cause coagulation since the charges are neutralised.