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EEJ MAIN Chemistry QUESTION #5526
Question 1
What is the maximum concentration of dissolved oxygen (DO) that can be present in cold water?
  • 14 ppm✔️
  • 8 ppm
  • 10 ppm
  • 16 ppm
Correct Answer Explanation
Dissolved oxygen (DO) levels depend on temperature — colder water can hold more dissolved oxygen. In cold water, DO can reach up to 14 ppm. Normal clean river water has DO around 8–10 ppm. A DO below 6 ppm is harmful to aquatic life. The correct answer is 14 ppm.