Question
For acid rain, the pH of rain water should be less than
NDA
General Ability
General Science
2025
NDA 2025 (Phase 1)
NDA General Ability Question (2025) — Solution
Options
- A. 7.0
- B. 6.6
- C. 5.6
- D. 8.0
Answer
C. 5.6
Step-by-step solution
Normal rain water has a pH of about 5.6 due to the dissolution of atmospheric carbon dioxide, which forms carbonic acid (H_2CO_3). When the pH of rain water drops below 5.6, it becomes more acidic than normal and is classified as acid rain. Answer: 5.6
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