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Assertion Carbon monoxide is a poisonous gas. Reason Carbon monoxide combines with haemoglobin to form carboxyhaemoglobin whch prevents absorption of oxygen by it.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Correct answer: Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Solution

Carbon monoxide is poisonous because it binds strongly with haemoglobin to form carboxyhaemoglobin. This reduces haemoglobin’s ability to carry oxygen, causing oxygen deprivation in tissues.

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