Name the gas used in preparation of bleaching powder

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Q: 191 (SSC/NA)
Name the gas used in preparation of bleaching powder
AnyChart Trial Version

question_subject: 

Science

question_exam: 

SSC

stats: 

0,34,15,5,8,2,34

keywords: 

{'bleaching powder': [1, 0, 0, 2], 'chlorine': [8, 2, 8, 9], 'gas': [9, 1, 9, 27], 'oxygen': [3, 0, 1, 0], 'nitrogen': [1, 1, 0, 2], 'hydrogen': [0, 0, 1, 3], 'preparation': [3, 0, 4, 3]}