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Railways PYQCBT 1 2016

RRB NTPC · Question 28

________extinguishes fire.

  1. O_2
  2. CO_2
  3. SO_2
  4. NO_2
Show answer & explanation

Answer: (B) CO_2

Explanation

Carbon dioxide is heavier than air and does not support combustion, so it smothers a fire by cutting off oxygen.