oxygen, nitrogen, carbondioxide, carbon monoxide--------which is odd one out and why

The correct one is carbon monoxide
Oxygen, nitrogen and carbon dioxide are naturally present in the atmosphere while as carbon monoxide is produced by the incomplete combustion of any fuel like wood.
 

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carbon monooxide because it is not natural gas

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please thumps up

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Carbon monoxide is the odd one out because oxygen, nitrogen and carbon-dioxide are present in the atmosphere in a larger quantity and oxygen carbondioxide and nitrogen are present in the ground when coal is being formed.

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