A) \[KCl\]
B) \[KN{{O}_{3}}\]
C) \[{{K}_{2}}S{{O}_{4}}\]
D) \[{{K}_{3}}[Fe{{(CN)}_{6}}]\]
Correct Answer: D
Solution :
\[{{K}_{3}}[Fe{{(CN)}_{6}}]\] is most effective in coagulating a ferric hydroxide sol.
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