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