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Suggest a Reason as to Why Co is Poisonous. - Chemistry

Suggest a reason as to why CO is poisonous.

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Solution 1

Carbon monoxide is highly-poisonous because of its ability to form a complex with haemoglobin. The CO–Hb complex is more stable than the O2–Hb complex. The former prevents Hb from binding with oxygen. Thus, a person dies because of suffocation on not receiving oxygen. It is found that the 
CO–Hb complex is about 300 times more stable than the O2–Hb complex.

Solution 2

CO reacts with haemoglobin to form carboxyhaemoglobin which can destroy the oxygen carrying capacity of haemoglobin and the man dies of suffocation.

Concept: Some Important Compounds of Carbon and Silicon - Carbon Monoxide
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NCERT Class 11 Chemistry Textbook
Chapter 11 The p-Block Elements
Q 17 | Page 324
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