Alum helps in purifying water by 

  1. A

    forming Si complex with clay particles 

  2. B

    sulphate part which combines with the dirt and removes  it

  3. C

    aluminium which coagulates the mud particles 

  4. D

    making mud water soluble 

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    Solution:

    Alum coagulates mud particles and helps in purifying  water. 

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