CHEM Class 7 | NCERT Ch 18 - Wastewater Story | Topic 1 - Waste water
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- Опубліковано 16 тра 2024
- Review Questions:
1. Mention the domestic uses of water.
2. Why does water become wastewater after its use?
3. What are the different types of pollutants present in water?
4. Define sewage.
5. What is the need for sewage treatment and where it is done?
