Question

Given below are two statements:
Statement I: If BOD value is 4 ppm and dissolved oxygen is 8 ppm, it is a good quality water.
Statement II: If the concentration of zinc and nitrate is 5 ppm, then it can be used as good quality water.

• A. Statement I is correct but statement II is incorrect
• B. Statement I is incorrect but statement II is correct
• C. Both statements I and II are incorrect
• D. Both statements I and II are correct

Hint:

When evaluating water quality, check for parameters like BOD, dissolved oxygen, and concentrations of hazardous elements such as zinc and nitrates.

Answer 1

The Correct Option is D

- Statement I: A BOD value of 4 ppm and a dissolved oxygen level of 8 ppm indicate that the water has a good quality because the dissolved oxygen should be higher than the BOD to support aquatic life.
- Statement II: If the concentration of zinc and nitrate is 5 ppm, this is within permissible limits for drinking water, indicating good quality.
Both statements are correct as they provide accurate interpretations of water quality standards.