A) For coagulation of \[A{{s}_{2}}{{S}_{3}}\] sol, \[+\,\text{ve}\]ions are effective.
B) For coagulation of aluminiumhydroxide sol \[B{{a}^{2\,+}}\]ions are more effective than \[N{{a}^{+}}\]
C) Cellulose solution is an example of macromolecular colloid system
D) Colloidal sol of metals such as gold, silver etc are prepared by Bredig's arc method.
Correct Answer: B
Solution :
Aluminium hydroxide is a +ve sol, so \[-\,ve\]ions are effective in coagulation.
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