Assertion :Carbon monoxide is a poisonous gas. Reason: Carbon monoxide combines with haemoglobin to form carboxy-haemoglobin whch prevents absorption of oxygen by it.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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.
Hence both Assertion and Reason are correct also Reason is correct explanation for Assertion.