Bleaching powder used in water purification has the chemical formula as :
MH SET - 2018, SET Exam - 2018,
Answer: C
Bleaching powder is CaOCl\(_{2}\).
Bleaching powder, or chlorinated lime, is made by passing chlorine over slaked lime and is written CaOCl2 (more precisely Ca(OCl)Cl). In water it releases hypochlorous acid and hypochlorite, the 'available chlorine' that disinfects drinking water; good samples hold about 30 to 35 per cent.
CaCl2 is calcium chloride, a drying agent with no disinfecting chlorine. NH4OH is ammonia solution and NH4Cl is ammonium chloride (sal ammoniac); neither is bleaching powder.
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