A) \[{{O}_{2}}\]
B) \[C{{O}_{2}}\]
C) Fuel
D) Heat
Correct Answer: B
Solution :
Carbon dioxide\[(C{{O}_{2}})\]is not required for combustion. Rather, it is used as a fire extinguisher. Since carbon dioxide is heavier than oxygen, it covers the fire like a blanket and cuts off the contact between the fuel and oxygen, thereby dousing the fire. The correct answer is B.
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