A) \[\operatorname{NaCl}\]
B) \[\operatorname{KCl}\]
C) \[{{\operatorname{BaCl}}_{2}}\]
D) \[{{\operatorname{AlCl}}_{3}}\]
Correct Answer: D
Solution :
\[{{\operatorname{AlCl}}_{3}}\] Coagulating value: Minimum amount of an electrolyte (millimoles) that must be, added to one litre of a colloidal solution so as to bring about complete coagulation is called coagulation value. For coagulation of a negatively charged sol \[\left( A{{s}_{2}}{{S}_{3}} \right)\] its value for NaCI = 52 \[\begin{align} & KC1~~~= 49.5 \\ & BaC{{I}_{2}} = 0.69 \\ & AlCl{{g}_{3}} = 0.093 \\ \end{align}\]
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