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Q.

Carbon dioxide extinguishes a fire by


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a

Carbon dioxide supports the combustion

b

Reducing the heat and cutting off oxygen

c

The molecule of carbon dioxide spread very low

d

Upper its ignition temperature 

answer is B.

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Detailed Solution

Carbon dioxide extinguishes fire by reducing the heat and cutting off oxygen.
Cutting off the supply of oxygen is used to extinguish a fire. This can be done with the help of carbon dioxide gas, which is not a supporter of combustion. It is heavier than air. The carbon dioxide is very cold as it comes out of the extinguisher. It cools down the combustible substance below its ignition temperature.
 
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