Question

22. The amount of dissolved oxygen present in drinking water is
1 point
2-4 ppm
10-14 ppm
< 4 ppm
O
4-8 ppm
17. Which of the following is not a secondary pollutant?
1 point
sulphuric acid
Ozone
Hydrocarbons
Peroxy Acetyl Nitrate​

Answer 1

Answer:

1. O
2. sulphuric acid

Explanation:

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