Question

10. Which of the following methods of purification of water involves change of state of w
a. Distillation
b. Filtration
c. Sedimentation and decantation d. Addition of chlorine tablets
B. Fill in the blanks with the correct words.
1.
(Carbon dioxide/Oxygen) occupy 20.95% of the total volume of the
Pollution of Air and Water​

Answer 1

Answer:

The methods used include physical processes such as filtration, sedimentation, and distillation; biological processes such as slow sand filters or biologically active carbon; chemical processes such as flocculation and chlorination; and the use of electromagnetic radiation such as ultraviolet light.