Question

The gas which helps to keep swimming pool clean is:
A. Chlorine
B. Oxygen
C. Argon
D. Helium

Answer 1

Hint- In order to solve this problem we will see the process involved and the requirement for the cleaning of the swimming pool. Next we will compare from the options given the best gas which has cleaning property and can be used for cleaning of medium water sources.

Complete answer:
If the water stays in the pool for longer duration and is not changed, there are various bacteria and e-coli that develop in the water and make the water harmful and hazardous for swimmers.
Chlorine is generally added into the water in order to kill germs. When it is added to a swimming pool, it forms a weak acid called hypochlorous acid that kills bacteria like salmonella and E. coli, as well as germs that cause viruses such as diarrhea and swimmer’s ear.
Pools are sanitized using a variety of chlorine-based compounds including chlorine gas, sodium hypochlorite (liquid bleach), calcium hypochlorite, lithium hypochlorite and chlorinated isocyanurates. When any of the given compounds comes into contact with water, they liberate hypochlorous acid (HOCl), which is the active sanitizing agent.
Hence, chlorine gas helps to keep the swimming pool clean.

So, the correct answer is option A.

Note- Chlorine is a naturally-occurring chemical element and one of the basic building blocks of matter. Chlorine is produced from ordinary salt, by passing an electric current through a solution of brine (common salt dissolved in water) in a process called electrolysis. Chlorine chemistry helps combat germs and preserve sanitized water in the ocean, and swimmers are not exposed to dangerous amounts of bacteria that cause disease.