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Carbon monoxide (CO) is harmful to man because

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Carbon monoxide (CO) is harmful to man because

(a) it forms carbolic acid.

(b) it generates excess CO2.

(c) it is carcinogenic.

(d) it competes with O2 for haemoglobin.

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Correct answer: (d) it competes with O2 for haemoglobin.

Explanation:

CO is highly toxic and impairs respiration. CO combines with haemoglobin of blood and reduces its O2 carrying capacity.

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