EET PG Medical – 2020 – Question – 113
The active disinfectant property of bleaching powder is due to:
a) Chlorine
b) Hypochloric acid
c) Hypochlorous acid
d) Chloramines
Show Answer
Correct Answer – C
Ans. C. Hypochlorous acid
Hypochlorous acid is the most effective form of chlorine for water disinfection.
The active component of bleaching powder, CaOCl2, is hypochlorous acid.
The disinfecting action of chlorine is mainly due to hypochlorous acid, and to a small extent due to the hypochlorite ions.
Park’s PSM 24th ed. Page no. 138
