A) \[NaCl\]
B) \[BaC{{l}_{2}}\]
C) \[{{K}_{2}}Cr{{O}_{4}}\]
D) \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]
Correct Answer: D
Solution :
The solution of \[Fe{{(OH)}_{3}}\]is a negative colloidal sol. For coagulation of \[Fe{{(OH)}_{3}},\] negative ions are effective ion. \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] have a highest coagulating power for \[Fe{{(OH)}_{3}}\] \[{{K}_{4}}[Fe{{(CN)}_{6}}]\rightleftharpoons 4{{K}^{+}}+Fe(CN)_{6}^{4-}\] Greater is the valency of effective ion, more is its coagulation power.
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