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NDA 2021 GAT · General Knowledge · Chemistry in Everyday Life · easy

Which gas is commonly used in fire extinguishers?

Single correct option

Which gas is commonly used in fire extinguishers?
  1. A. Oxygen
  2. B. Hydrogen
  3. C. Carbon dioxide
  4. D. Nitrogen dioxide
Show answer and solution

Answer: (C) Carbon dioxide

Carbon dioxide is denser than air and does not support combustion, so it blankets a fire and cuts off oxygen. Oxygen and hydrogen would feed the fire, and nitrogen dioxide is a toxic gas. CO2 is especially useful for electrical and oil fires.
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Original question written in the NDA 2021 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake