JEE Main Chemistry question

Not in JEE Main or NEET syllabus

A negatively charged suspension of clay in water needs, for precipitation, the minimum amount of:

(A)Aluminium chlorideCorrect
(B)Potassium sulphate
(C)Sodium hydroxide
(D)Hydrochloric acid

Answer: (A)

Solution

For a negatively charged colloid, coagulation is brought about by the cation of the added electrolyte, and the Hardy-Schulze rule states that the coagulating power increases sharply with the valency of this cation; since

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Question ID VK-145083