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Railways PYQCBT 1 2016

RRB NTPC · Question 30

Acid Rain has pH value of A. 5.5 or less B. 12.5 or more C. 10.5 or more D. 8.5 or more

  1. A

  2. D

  3. B

  4. C

Show answer & explanation

Answer: (A) A

Explanation

Normal rain is slightly acidic (pH about 5.6) because of dissolved CO₂. Rain with a pH of about 5.5 or lower is called acid rain; it is caused by sulphur dioxide and nitrogen oxides forming acids in the air.