How does carbon dioxide help in putting out fire in a soda-acid fire extinguisher?
Answer and explanation
Correct answer: By separating the fire from oxygen
The governing concept is that combustion requires a continuous supply of oxygen. In a soda-acid extinguisher, a reaction produces carbon dioxide, which is non-combustible and denser than air. It spreads around the flame and displaces or cuts off atmospheric oxygen, so combustion cannot continue. Option A is correct. CO₂ does not supply oxygen, form hydrogen, or extinguish fire by making it acidic.
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What is the correct answer to this question?
By separating the fire from oxygen
Why is this the correct answer?
The governing concept is that combustion requires a continuous supply of oxygen. In a soda-acid extinguisher, a reaction produces carbon dioxide, which is non-combustible and denser than air. It spreads around the flame and displaces or cuts off atmospheric oxygen, so combustion cannot continue. Option A is correct. CO₂ does not supply oxygen, form hydrogen, or extinguish fire by making it acidic.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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