JEE Main 2023 — Environmental Chemistry Question with Solution
JEE Main 2023 (29 Jan Shift 2)
Question
The concentration of dissolved Oxygen in water for growth of fish should be more than and Biochemical Oxygen Demand in clean water should be less than . and in ppm are, respectively.
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Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
The concentration of dissolved oxygen in water is very important for aquatic life. If the concentration of dissolved oxygen of water is below 6 ppm, the growth of fish gets inhibited. The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water, is called Biochemical Oxygen Demand (BOD). The amount of BOD in the water is a measure of the amount of organic material in the water, in terms of how much oxygen will be required to break it down biologically. Clean water would have BOD value of less than 5 ppm whereas highly polluted water could have a BOD value of 17 ppm or more.
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This is a previous-year question from JEE Main 2023, covering the Environmental Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.