![Which materials are hard to remove from the polluted water?](https://www.gkseries.com/blog/wp-content/uploads/2022/09/Which-materials-are-hard-to-remove-from-the-polluted-water.png)
Q. Which materials are hard to remove from the polluted water?
- Sand
- Plastic
- Solids
- Dissolved salts
Answer: Dissolved salts
Answer: Dissolved salts
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