A coagulating agent frequently added to water to remove the suspended and colloidal impurities is
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a
Mohr salt
b
Alum
c
Bleaching powder
d
Copper sulphate
answer is B.
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Detailed Solution
Alum is a coagulating agent frequently added to water to remove impurities from water because impurities contain negative charge and alum gives positive charge particle for coagulation.