Which one of the following gases is used for the purification of drinking water ?

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Q: 17 (UPPSC/2013)

Which one of the following gases is used for the purification of drinking water ?

question_subject: 

Science

question_exam: 

UPPSC

stats: 

0,109,12,5,109,5,2

keywords: 

{'gases': [0, 0, 5, 12], 'carbon dioxide': [2, 0, 5, 6], 'purification': [0, 0, 1, 2], 'sulphur dioxide': [0, 0, 0, 1], 'chlorine': [8, 2, 8, 9], 'drinking water': [0, 0, 0, 1], 'fluorine': [0, 0, 0, 1]}