A) Incomplete combustion of coal produces carbon monoxide, which is poisonous
B) Incomplete combustion of coal produces carbon dioxide, which is poisonous
C) Burning of coal produces oxides of nitrogen, the fumes of which are very toxic
D) Burning of coal produces oxides of nitrogen that combine with moisture present in air to form acids
Correct Answer: A
Solution :
Incomplete combustion of fuels such as coal produces carbon monoxide (CO) gas. Carbon monoxide is a poisonous gas and can even result in death, if inhaled in large quantities. Hence, it is dangerous to burn coal in a closed room while sleeping. The correct answer is A.
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