Question

Fire produced by oil cannot be controlled by---------.
A. \[C{{O}_{2}}\]
B. Foam
C. Both A and B
D. Water

Answer 1

Hint: When oil is getting hot, first oil gets boiled then it releases smoke and later it catches fire. If we want to stop the fire caused by an oil then we are supposed to use a substance which should separate the fire from the surface of oil.

Complete step by step answer:
-Fire caused by oil should be controlled by using a chemical which should not react with oil.
-Coming to given options, option A, carbon dioxide (\[C{{O}_{2}}\]). Carbon dioxide displaces the oxygen gas which is present in the surrounding environment of the fire. Carbon dioxide is very cold when it is coming out from the extinguisher and it cools the oil as well.

-Coming to option B, Foam. Foam forms a blanket like structure on the oil surface and reduces the fire. The foam separates the surface of the oil from oxygen and cools the oil. Then the fire will be stopped slowly. So, carbon dioxide and foam can be used to put off the fire.

-Coming to option D, water. Whenever we are going to add water to the fire caused by oil then the fire expands more because specific gravity of the water is high. So, whenever we are going to add water to fire caused by oil, then oil floats on water and still the fire expands. So, water is not supposed to be used to stop fire caused by oil.
So, the correct answer is “Option D”.

Note: We have to use only the chemicals which will separate the oil from oxygen. Then only we can stop the fire caused by oil. We are not supposed to use water and the chemicals which have features nearer to water to stop the fire caused from oil.