A) For coagulation of \[A{{s}_{2}}{{S}_{3}}\] sol, +ve ions are effective.
B) For coagulation of aluminium hydroxide 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 :
[B] Aluminium hydroxide is a \[+ve\]sol, so \[\,ve\]ions are effective in coagulation.
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