A) magnesium nitrate
B) potassium nitrate
C) potassium sulphate
D) aluminium nitrate
Correct Answer: D
Solution :
\[A{{s}_{2}}{{S}_{3}}\] sol is a negative sol due to preferential adsorption of \[{{S}^{2-}}\] ions. \[[A{{s}_{2}}{{S}_{3}}]{{S}^{2-}}\] Hence, a cation is needed to coagulate it. According to Hardy Schulze law, aluminium nitrate will be the most efficient to coagulate it as it gives the most valent aluminium ion \[(A{{l}^{3+}})\], hence it is required in minimum amount, (i.e., coagulation value is least for \[Al{{(N{{O}_{3}})}_{3}}\].
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