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- Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Polluted water may ha
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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Polluted water may have a value of BOD of the order of 17ppm.
Reason R: BOD is a measure of oxygen required to oxidise both the bio-degradable and non- biodegradable organic material in water.
In the light of the above statements, choose the most appropriate answer from the options given below.
Both A and R are correct and R is the correct explanation of A.
Both A and R are correct but R is NOT the correct explanation of A.
A is correct but R is not correct.
A is not correct but R is correct.
Answers (1)
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 by bacteria.
Clean water would have BOD value of less than 5ppm whereas highly polluted water could have a BOD value of 17ppm or more.
So, A is correct but R is not correct.
Option (3) is correct.
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