Q.
Alum is added to purify muddy water.The phenomenon that occurs during purification of muddy water is
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a
Coagulation of positively charged colloidal particles of muddy water by anions of Alum
b
Solubility of Alum in muddy water due to hydrogen bond formation
c
Coagulation of negatively charged particles of muddy water by cations of Alum
d
Both 2 and 3
answer is C.
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Detailed Solution
Muddy water contains negatively charged colloidal particles of clay which are coagulated by cations of Alum.
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