Question

the ____ method of purifying water involves spraying water into the air so that sunlight and oxygen can kill most of the bacteria present.

answer options:
select one of four

aeration
chlorination

coagulation
filtration

Explanation:

To solve this, we analyze each option:

• Aeration: Involves exposing water to air (spraying into air), allowing sunlight and oxygen to act on bacteria.
• Chlorination: Uses chlorine to disinfect, not spraying into air.
• Coagulation: Uses chemicals to clump impurities, not related to air exposure.
• Filtration: Uses filters to remove particles, not air exposure.

So aeration matches the description.

Answer:

A. aeration