Question
Chemistry Question on Surface Chemistry
Alum is a water purifier because it
A
coagulates the impurities
B
softens hard water
C
gives taste
D
destroys the pathogenic bacteria
Answer
coagulates the impurities
Explanation
Solution
Alum is a water purifier due to its coagulating power. It precipitates out the colloidal impurities present in water, which may be separated by filteration.