Question

Municipality officials use chlorine in water purification because:

• A. chlorine cleans water
• B. chlorine helps water to cool easily
• C. chlorine coagulates mud particles
• D. chlorine kills harmful bacteria

Answer 1

The correct option is D chlorine kills harmful bacteria

Chlorine is very effective in killing harmful waterborne pathogens like E. coli and salmonella. When chlorine is added to water, it breaks down into hypochlorite ion and hypochlorous acid, both of which oxidise and kill microorganisms.