Which gas is used for the manufacturing of Bleaching Powder?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Chlorine gas
Bleaching powder (calcium oxychloride, \(\ce{CaOCl2}\)) is made by passing chlorine gas over dry slaked lime:
\(\ce{Ca(OH)2 + Cl2 -> CaOCl2 + H2O}\)
It is used to bleach cotton and paper and to disinfect drinking water, because it releases chlorine.