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Balbeer M.
's Polls
GK
For purifying drinking water alum is used
A. for coagulation of mud particles
1 vote (100%)
A. for coagulation of mud particles
B. to kill bacteria
0 votes (0%)
B. to kill bacteria
C. to remove salts
0 votes (0%)
C. to remove salts
D. to remove gases
0 votes (0%)
D. to remove gases
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