Question 229Safety & Environmental - Assistant Engineer

The correct answer is D) Carbon monoxide. Carbon monoxide is the poisonous gas most likely to be found in a closed compartment involved in a fire. This is because carbon monoxide is a byproduct of incomplete combustion, which is common in fires with limited oxygen supply. The other gases listed - nitrogen, hydrogen, and carbon dioxide - are not inherently poisonous in this context. Nitrogen and carbon dioxide are not flammable, and hydrogen is flammable but not poisonous. Therefore, carbon monoxide poses the greatest risk of poisoning in a fire-related scenario involving a closed compartment.