Multiple choice

Why is fire extinguished by soda bicarbonate?

  1. Soda bicarbonate decompose on heating to produce carbon dioxide-gas which extinguishes fire.

  2. Soda bicarbonate serves as a blanket for fire.

  3. Soda bicarbonate releases water extinguishing the fire.

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sodium bicarbonate (baking soda) decomposes when heated to release carbon dioxide gas. Since carbon dioxide is denser than air and does not support combustion, it smothers the fire.

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