Question

1.gas used to remove soluble impurities is present in water.
2.pipes made up of cast iron or PVC
3.a big concrete or steel tank.
4.technique used to remove solid waste to that can be easily collected.
5.chemicals used to protect the crops from insects.​

Answer 1

Answer:

1 Chlorine gas

2 PVC piping

3

4Incineration

5Insecticides or pesticides

Answer 2

Answer:

1.chlorine

2.sewers

3.septic tank

4.screening

5.chemical fertilizer and pesticides

Explanation:

according to the chapter-19 titled Management of wastewater of class 7 Universal Science