Question
Question: Which out of the following electrolyte solutions having the same concentration will be most effectiv...
Which out of the following electrolyte solutions having the same concentration will be most effective in causing the coagulation of arsenic sulphide sol?
A
KCl
B
MgCl2
C
AlCl3
D
NaPO4
Answer
AlCl3
Explanation
Solution
As2 S3is a negatively charged sol. To cause its coagulations, the ions must be positively charged. Greater the magnitude of positive charge, grater will be its coagulating power. Thus AlCl3 containing Al3+ion will be most effective in causing coagulation of As2 S3 .