Carbon monoxide is a colourless, odourless and tasteless gas which is slightly lighter than air. It is highly toxic to humans in larger quantities. Carbon monoxide is produced when there is not enough oxygen to carbon dioxide, and is always created during a combustion because there is never a perfect combustion. When inhaled, carbon monoxide bond with haemoglobin in the bloodstream and block the normal absorption of oxygen by the blood, thus causing suffocation due to lack of oxygen. Carbon monoxide is made up of carbon and oxygen element, and both of them are harmless. Oxygen is needed for releasing energy in our body, and carbon is used for pencil lead, etc.
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