Dissolved oxygen content in river water is around _____________ ppm?
Correct answer: A. 5
- A. 5
- B. 100
- C. 250
- D. 500
Explanation
River water commonly contains dissolved oxygen of several milligrams per litre, often around 5 mg/L under ordinary conditions. Values of 100 mg/L or more are physically unrealistic for oxygen dissolved in surface water.
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