NEET2015BotanyEnvironmental IssuesActual
Acid rain is caused by the increase in the atmospheric concentration of :
Options
- AS O 3 and SO
- BC O 2 and CO
- CO 3 and dust
- DS O 2 and N O 2
Correct answer
D. S O 2 and N O 2
Step-by-step solution
During rainfall, S O 2 and N O 2 can decrease the pH of rain water. The oxides of sulphur combine with water to form sulphuric acid, while the oxides of nitrogen produce nitric acid by reacting with water. Thus, the pH of rain water becomes acidic (pH less than 5.5).