Which one of the following materials is suitable for water purification?

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Q: 79 (NDA-II/2008)

Which one of the following materials is suitable for water purification?

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,21,30,18,21,4,8

keywords: 

{'water purification': [0, 0, 1, 1], 'zeolites': [0, 0, 1, 0], 'materials': [0, 1, 1, 0], 'asbestos': [2, 0, 1, 0], 'silicones': [0, 0, 1, 0], 'quartz': [0, 0, 0, 1]}