Question

The BOD values for pure water and highly polluted water are respectively:

• A. \(>5 \, {ppm}, \leq 17 \, {ppm} \)
• B. \(>5 \, {ppm}, \geq 17 \, {ppm} \)
• C. \(<5 \, {ppm},>17 \, {ppm} \)
• D. \(<5 \, {ppm}, \leq 17 \, {ppm} \)

Hint:

BOD values provide insight into the level of organic pollutants in water. Pure water has a low BOD, while highly polluted water has a high BOD.

Answer 1

The Correct Option is C

BOD (Biochemical Oxygen Demand) is a measure of the amount of oxygen required by microorganisms to decompose organic matter in water. In pure water, the BOD value is low, typically less than 5 ppm, as it contains fewer organic pollutants. For highly polluted water, the BOD value is high, typically greater than 17 ppm, because of the increased amount of organic material present. 
Step 1: For pure water, the BOD is generally less than 5 ppm. For highly polluted water, the BOD is generally greater than 17 ppm. 
Step 2: Thus, the correct relationship between the BOD values for pure and highly polluted water is \(<5 \, {ppm},>17 \, {ppm} \).