Question:
In urban air pollution, the most poisonous gas is supposed to be carbon monoxide. It is hazardous because it
In urban air pollution, the most poisonous gas is supposed to be carbon monoxide. It is hazardous because it
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Remember:
\[
\boxed{
\mathrm{CO + Hb \rightarrow COHb}
}
\]
Carbon monoxide has nearly \(200\)-\(250\) times greater affinity for haemoglobin than oxygen.
Updated On: Jul 23, 2026
- Affects our sense of smell
- Is carcinogenic in nature
- Combines with hemoglobin
- Causes blindness
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Concept:
Carbon monoxide (CO) is a colourless, odourless, and highly poisonous gas produced due to incomplete combustion of fuels.
It is hazardous because it combines readily with haemoglobin in blood to form carboxyhaemoglobin (COHb), thereby reducing the oxygen-carrying capacity of blood.
\[
\boxed{
\mathrm{CO + Hb \rightarrow COHb}
}
\]
Carbon monoxide has approximately \(200\) to \(250\) times greater affinity for haemoglobin than oxygen.
Step 1: Understand the harmful effect of CO. When inhaled, \[ \mathrm{CO} \] replaces oxygen from haemoglobin, preventing oxygen transport to body tissues. This may cause headache, dizziness, unconsciousness, and even death.
Step 2: Identify the correct reason. Hence, \[ \boxed{\text{Carbon monoxide is hazardous because it combines with haemoglobin}.} \] Therefore, the correct option is \[ \boxed{(C)\;\text{Combines with hemoglobin}.} \]
Step 1: Understand the harmful effect of CO. When inhaled, \[ \mathrm{CO} \] replaces oxygen from haemoglobin, preventing oxygen transport to body tissues. This may cause headache, dizziness, unconsciousness, and even death.
Step 2: Identify the correct reason. Hence, \[ \boxed{\text{Carbon monoxide is hazardous because it combines with haemoglobin}.} \] Therefore, the correct option is \[ \boxed{(C)\;\text{Combines with hemoglobin}.} \]
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