Q.

Alum helps in purifying water by 

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a

forming Si complex with clay particles 

b

Sulphate part which combines with the dirt and removes it 

c

coagulating the mud particles 

d

making mud water soluble 

answer is C.

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Detailed Solution

Alum furnisheds Al3+ ions which bring about coagulation of negatively charged clay poarticles bacteria etc.  

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Alum helps in purifying water by