JEE Main 2002 Chemistry question

Alum helps in purifying water by

(1)forming Si complex with clay particles
(2)sulphate part which combines with the dirt and removes it
(3)coagulating the mud particlesCorrect
(4)making mud water soluble

Answer: (3)

Solution

Mud/clay particles in water form a negatively charged colloid. Alum supplies ions of high charge, which neutralise the charge on the colloidal particles (Hardy–Schulze rule) and

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Question ID VK-037938