Sanitary Engineer Licensure Exam Practice Questions - PRC Sanitary Engineer Licensure Examination (SELE) Exam

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Free residual chlorine is generally preferred over combined chlorine (chloramines) for primary disinfection of drinking water mainly because free chlorine is:

A weaker oxidant requiring longer contact Incapable of inactivating viruses A more powerful and faster-acting disinfectant Only effective above pH 9

Correct Answer:

A more powerful and faster-acting disinfectant

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