Question

Which one of the following is not used for disinfection of drinking water?
A. Chlorine
B. Ozone
C. Chloramine
D. Phenyl

Answer 1

Hint: Disinfection is an important barrier when high-quality water is required, such as drinking water, home water, or cattle watering. Disinfection is the process of killing disease-causing germs. In most municipal water treatment systems, disinfection is the final step. Disease is caused by pathogenic organisms.

Complete answer: Disinfection is the process of removing most pathogenic germs from inanimate things (except bacterial spores). Disinfectants are chemicals that are used in disinfection. Disinfectants have diverse target ranges, and not all disinfectants are capable of killing all germs. It has the potential to influence the substances to which it is applied.

Chlorine, chlorine dioxide, and ozone are the three most prevalent compounds used as major disinfectants. Monochloramine, often known as chloramine, is used in distribution as a residual disinfection.
Phenyl is a disinfectant that cannot be used to purify drinking water because it will destroy bacteria pathogens but will impair the water's quality because it is harmful to live beings. It has a strong odour. All of the other choices are utilised as disinfectants since they have no negative impact on water quality.
Hence the correct option is: (D) Phenyl

Note:
Disinfection is one of the most important water treatment processes because it renders microorganisms inactive in drinking water. However, disinfection by-products, which have been linked to cancer and reproductive/developmental issues, may have a negative impact on human health.