WAEC Chemistry 2025 Objective — Question 4
Question 4 of 50 from the West African Examinations Council (WAEC) Chemistry 2025 Objective paper, with the correct answer and a full explanation.
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Which of the following gases is used in fire extinguishers?
- A. Carbon (IV) oxideCorrect
- B. Nitrogen (IV) oxide
- C. Carbon (II) oxide
- D. Sulphur (IV) oxide
Explanation
Carbon (IV) oxide (CO2) is commonly used in fire extinguishers because it displaces oxygen, thus suffocating the fire. CO2 is non-flammable and is heavier than air, so it effectively smothers flames by preventing oxygen from reaching them.
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