$CO$ (Carbon monoxide) is a neutral oxide of carbon,but it acts as a very strong field ligand and associates with metals to form complex compounds. These complex compounds are very useful in metallurgical processes. $CO$ is a poisonous gas because:
- AIt forms a complex with hemoglobin,which is incapable of carrying oxygen.
- BIt affects the lungs.
- CIt decomposes the protein part of our body.
- DIt associates with $H_2$ to form a gaseous mixture which is very lethal.
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