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which of the following statement is not correct about carbondioxide acting as a fire extinguisher for electrical fires? 

A. it is heavier than air 

B. it is lighter than air 

C. it is not combustion 

D. it does not support combustion

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B. it is lighter than air 

Carbon dioxide is lighter than air and forms a layer around the burning substance. It covers the fire like a blanket due to which fresh air cannot reach the burning substance.

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