Which gas is passed in the water to kill bacterias ?

Question

Accepted Answer

Chlorine is the correct answer for the question of which gas is passed in the water to kill bacteria. Chlorine is widely used in water treatment processes due to its strong disinfectant properties. When chlorine is added to water, it reacts to form hypochlorous acid, which is highly effective at killing bacteria, viruses, and other microorganisms. This process is known as chlorination and is a standard method for ensuring that drinking water is safe and free from harmful pathogens.

Now, let's examine why the other options are incorrect:

1. **Bromine**: While bromine can be used as a disinfectant, it is not commonly used for treating drinking water. Bromine is more often used in swimming pools and hot tubs because it is effective at higher temperatures and remains stable in a wider pH range. However, chlorine is preferred for drinking water due to its cost-effectiveness and efficiency.

3. **Iodine**: Iodine is another disinfectant that can kill bacteria, but it is not typically used for large-scale water treatment. Iodine is more commonly used for emergency water purification or in personal water purification tablets. It is not as widely used as chlorine for municipal water treatment due to cost and potential health concerns with long-term use.

4. **Nitrogen**: Nitrogen is an inert gas and does not have disinfectant properties. It is not used to kill bacteria in water. Nitrogen is primarily used in industrial applications and does not play a role in water disinfection.

In conclusion, chlorine is the most effective and widely used gas for killing bacteria in water, making it the correct choice for this question.