Q: 17 (UPPSC/2013)
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]}