A water sample has an initial dissolved oxygen of 8.8 ppm, which falls to 4.9 ppm after incubation for 5 days at 20 degC

Question

A water sample has an initial dissolved oxygen of 8.8 ppm, which falls to 4.9 ppm after incubation for 5 days at 20 degC (no dilution). Using the standard NCERT limits, the sample has a BOD of:

Accepted Answer

3.9 ppm, within the range for clean water

Answer

13.7 ppm, within the range for clean water

Answer

3.9 ppm, indicating heavy pollution

Answer

4.9 ppm, indicating heavy pollution

A water sample has an initial dissolved oxygen of $8.8 ppm$ , which falls to $4.9 ppm$ after incubation for 5 days at 20 $^{\circ}$ C (no dilution). Using the standard NCERT limits, the sample has a BOD of:

Answer: A

More questions on Water pollution, BOD and COD

A water sample has an initial dissolved oxygen of 8.8 ppm, which falls to 4.9 ppm after incubation for 5 days at 20 ∘C (no dilution). Using the standard NCERT limits, the sample has a BOD of:

Answer: A

More questions on Water pollution, BOD and COD

A water sample has an initial dissolved oxygen of $8.8 ppm$ , which falls to $4.9 ppm$ after incubation for 5 days at 20 $^{\circ}$ C (no dilution). Using the standard NCERT limits, the sample has a BOD of: