By which process, Alum cleans the muddy water ?

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Q: 58 (RAS/2011)
By which process, Alum cleans the muddy water ?

question_subject: 

Science

question_exam: 

RAS

stats: 

0,5,13,3,9,5,1

keywords: 

{'adsorption': [0, 0, 0, 1], 'alum': [0, 0, 1, 0], 'muddy water': [0, 0, 0, 1], 'dialysis': [2, 0, 0, 0], 'absorption': [0, 0, 0, 2], 'coagulation': [1, 0, 0, 0], 'process': [16, 0, 12, 37]}