A) it forms complex with clay particles
B) it coagulates the mud particles
C) it exchanges \[C{{a}^{2+}}\] and \[M{{g}^{2+}}\] ions present in hard water
D) its sulphate ion is water purifier
Correct Answer: B
Solution :
Mud is colloidal charged solution which on treatment with alum \[(A{{l}^{3+}})\] gets neutralised or coagulated.
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