Which gas is particularly dangerous due to its ability to bind with haemoglobin?

Carbon monoxide is particularly dangerous because it has a strong affinity for hemoglobin, the molecule in red blood cells that is responsible for transporting oxygen. When carbon monoxide is inhaled, it binds to hemoglobin much more effectively than oxygen does, forming carboxyhemoglobin. This binding reduces the amount of oxygen that can be carried in the blood, leading to oxygen deficiency in vital organs and tissues.

The risks associated with carbon monoxide exposure include headaches, dizziness, confusion, and in severe cases, loss of consciousness or death. Its colorless and odorless nature makes it hard to detect, which increases the danger of its presence in enclosed spaces, such as poorly ventilated rooms or during combustion processes that generate it.

Other gases mentioned in the options do not pose the same significant risk in terms of binding to hemoglobin. Carbon dioxide can be toxic at high levels, but it does not compete with oxygen for hemoglobin binding. Methane is a flammable gas and poses an explosion hazard but does not have harmful effects related to hemoglobin binding. Nitrogen dioxide is a harmful pollutant but is primarily an irritant and does not bind with hemoglobin in the same way as carbon monoxide. This makes carbon monoxide a uniquely hazardous gas due to its ability to