Choose the factor that increases the BOD of water supply:
Correct answer: A. CO2
- A. CO2
- B. O3
- C. H2O
- D. C2H5OH
Explanation
The correct answer is option A: CO2. When the levels of CO2 increase, it can stimulate bacterial growth, leading to higher BOD values in the water supply. Options B, C, and D are incorrect because ozone (Option B) can actually help reduce organic pollutants, water (Option C) does not directly impact BOD levels, and the impact of ethanol (Option D) on BOD levels is variable depending on concentration and water composition.
Last updated
About Environmental Chemistry
Atmospheric pollution includes smog, acid rain, greenhouse gases, ozone depletion and the effects of carbon monoxide, sulfur oxides, nitrogen oxides and particulate matter. Water pollution covers sewage, industrial waste, eutrophication and treatment stages, while green chemistry focuses on reducing hazardous substances, waste and energy use through safer, more efficient processes.
Practise Environmental Chemistry
221 free Environmental Chemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.