The unpolluted natural rainwater is slightly acidic due to the reaction of rain water with:
Correct answer: C. Carbon dioxide
- A. Sulphur dioxide
- B. Oxides of nitrogen
- C. Carbon dioxide
- D. Hydrogen present in air
Explanation
Unpolluted rain has a slightly acidic pH of 5.6, because carbon dioxide and water in the air react together to form carbonic acid, a weak acid. Also note that unpolluted air would not have A and B, hence C is the correct choice.
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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.
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