Question : Name the gas used in preparation of bleaching powder
Option 1: oxygen
Option 2: hydrogen
Option 3: nirtogen
Option 4: chlorine
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Correct Answer: chlorine
Solution : The correct option is chlorine.
Chlorine gas (Cl2) is utilised in the production of bleaching powder. The active component of bleaching powder is calcium hypochlorite, which is produced by bubbling chlorine gas through a slaked lime (calcium hydroxide) solution.
Ca(OH)2 + Cl2 → Ca(ClO)2 + H2O Here, calcium hydroxide (Ca(OH)2) reacts with chlorine gas (Cl2) to produce calcium hypochlorite (Ca(ClO)2) and water (H2O).
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