Q: 191 (SSC/NA)
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]}
The gas used in the preparation of bleaching powder is option 4, chlorine. Bleaching powder is a chemical compound used for various purposes, such as bleaching textiles, disinfecting water, and removing stains. It is made by reacting chlorine gas with slaked lime (calcium hydroxide). Chlorine gas is essential in this process as it oxidizes and converts calcium hydroxide into calcium hypochlorite, the main component of bleaching powder. This reaction creates a compound with strong bleaching properties. Therefore, option 4, chlorine, is the correct answer.