A) \[{{K}_{4}}[Fe{{(CN)}_{5}}]\]
B) \[N{{a}_{2}}P{{O}_{4}}\]
C) \[MgC{{l}_{2}}\]
D) \[AlC{{l}_{3}}\]
Correct Answer: D
Solution :
Gold sol (Au) is a negatively charged sol, so lowest concentration of\[AlC{{l}_{3}}\](due to\[A{{l}^{3+}}\]ion, the positive ion) is required to coagulate it.
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