A) \[NaN{{O}_{3}}\]
B) \[{{K}_{4}}[Fe(C{{N}_{6}})]\]
C) \[N{{a}_{3}}P{{O}_{4}}\]
D) \[MaC{{l}_{2}}\]
Correct Answer: B
Solution :
\[{{\operatorname{K}}_{4}}\left[ Fe{{\left( CN \right)}_{6}} \right]\] is most effective in the coagulation of gold solution.
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