JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Alum is added to muddy water because [Jamia Millia Islamia 2006]

(A)It acts as disinfectant
(B)It results in coagulation of clay and sandCorrect
(C)Clay is soluble in alum, hence removes it
(D)It makes water alkaline which is good for health

Answer: (B)

Solution

released by alum hydrolysis neutralises the negatively charged colloidal clay/sand particles suspended in muddy water, causing them to coagulate and settle

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Question ID VK-138281