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Question

Which of the following forms stable compound with haemoglobin?

A
O2
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B
CO2
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C
CO
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D
All of the above
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Solution

The correct option is C CO
Carbon monoxide is an atmospheric pollutant present in vehicular exhaust and cigarette smoke. Carbon monoxide is a poisonous gas and reduces oxygen carrying capacity of blood. One molecule of hemoglobin combines with four molecules of carbon monoxide to form carboxyhemoglobin. The colour of carboxyhemoglobin is cherry red.

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