JEE Main 2022ChemistryEnvironmental ChemistryEasyMCQ

JEE Main 2022 — Environmental Chemistry Question with Solution

JEE Main 2022 (26 Jun Shift 2)

Question

The measured BOD values tor four difterent water samples A-D are as tollows: A=3 ppm; B=18 ppm; C=21 ppm; D=4 ppm. The water samples which can be called as highly polluted with organic wastes, are

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Show full solutionCorrect option: C
Correct answer
CB&C

Step-by-step explanation

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.

Hence,Among the given samples, sample number B and C are polluted.

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About this question

This is a previous-year question from JEE Main 2022, 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.