Which of the following statement is not correct about carbon dioxide acting as a fire extinguisher for electrical fires?

1. it is heavier than air
2. it is lighter than air
3. it is not combustion
4. it does not support combustion

Correct answer: B. it is lighter than air

Explanation: 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.