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Question

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.

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