Burning coal in a closed room with no ventilation can kill the persons sleeping in it. Which gas produced by the burning is responsible?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Carbon monoxide
In a closed room the oxygen runs short, so the coal burns incompletely and gives off carbon monoxide. This poisonous gas combines with the haemoglobin of the blood and stops it from carrying oxygen, so sleeping persons can die.