Single correct option
The poisonous gas in vehicle exhaust that combines with haemoglobin of blood more strongly than oxygen is
- A. carbon dioxide
- B. nitrogen dioxide
- C. sulphur dioxide
- D. carbon monoxide
Show answer and solution
Answer: (D) carbon monoxide
Carbon monoxide, formed by incomplete burning of fuel, binds to haemoglobin about 200 times more strongly than oxygen does, forming carboxyhaemoglobin and reducing the oxygen supply to tissues. Carbon dioxide is not the one that blocks haemoglobin to such an extent, and nitrogen dioxide and sulphur dioxide are irritants to the lungs and contribute to acid rain.
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