1. Tardigrade
  2. Question
  3. Chemistry
  4. 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 17 ppm. Reason R: BOD is a measure of oxygen required to oxidise both the biodegradable and nonbiodegradable organic material in water. In the light of the above statements, choose the most appropriate answer from the options given below.

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Q. 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 $17 \,ppm$.
Reason R : BOD is a measure of oxygen required to oxidise both the biodegradable and nonbiodegradable organic material in water.
In the light of the above statements, choose the most appropriate answer from the options given below.

JEE MainJEE Main 2022Environmental Chemistry

Solution:

Clean water have $BOD$ less than $5\, ppm$ while highly polluted water has $BOD$ greater or equal to $17 \,ppm$. So, assertion is correct. $BOD$ is measure of oxygen required to oxidise only bio-degradable organic matter. So, reason is false.