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  4. Assertion: Carbon monoxide is a poisonous gas. Reason: Carbon monoxide combines with haemoglobin to form carboxy-haemoglobin which prevents absorption of oxygen by it.

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Q. Assertion : Carbon monoxide is a poisonous gas.
Reason : Carbon monoxide combines with haemoglobin to form carboxy-haemoglobin which prevents absorption of oxygen by it.

The p-Block Elements

Solution:

Carbon monoxide (chemical formula CO) is a colorless, odorless, flammable and highly toxic gas. The highly poisonous nature of $CO$ arises because of its ability to form a complex with haemoglobin, which is about 300 times more stable than the oxygen-haemoglobin complex. This prevents haemoglobin in the red blood corpuscles from carrying oxygen round the body and ultimately resulting in death.