Why should we not sleep on a closed room with a coal fire burning in it?
We should not sleep in a closed room with a coal fire burning in it because in closed room , coal after utilising all oxygen start burning incompletely. This leads to release of poisonous gas which has no taste, smell, and colour and is called Carbon monoxide. Carbon monoxide mix with our blood haemoglobin and form carboxyhaemoglobin. Haemoglobin has much higher affinity for ​Carbon monoxide than oxygen. Formation of carboxyhaemoglobin decreases the oxygen carrying capacity of haemoglobin and then we start feeling suffocated. This is called Carbon monoxide poisoning.