JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Potash alum is used in purification of water because:

(A)It kills the micro-organisms
(B)It precipitates the colloidal matterCorrect
(C)It removes the hardness of water
(D)It catalyses the removal of impurities

Answer: (B)

Solution

Potash alum, on hydrolysis, releases ions which coagulate and precipitate negatively charged colloidal impurities suspended in water, clarifying it. It does not act as a disinfectant to kill micro-organisms (A), it

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Question ID VK-137767