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NDA 2025
Exam
NDA
Year
2025
Subject
General Ability
Chapter
General Science

NDA 2025 · General Ability · General Science

For acid rain, the pH of rain water should be less than

For acid rain, the pH of rain water should be less than

Options

  1. A7.0
  2. B6.6
  3. C5.6
  4. D8.0

Correct answer

C. 5.6

Step-by-step solution

Normal rain water has a pH of about 5.65.6 due to the dissolution of atmospheric carbon dioxide, which forms carbonic acid (H_2CO_3).<br><br>WhenthepHofrainwaterdropsbelow5.6).<br><br>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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