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Question
Identify the gas that is generally produced when coal is burnt in the presence of a lot of air.
Options:
A .  Carbon monoxide
B .  Sulphur dioxide
C .  Carbon dioxide
D .  Nitrogen dioxide
Answer: Option C
:
C
Coal is mainly composed of carbon. When coal is burnt in the presence of air, carbon reacts with oxygen gas that is present in air (atmosphere) and produces carbon dioxide gas (CO2).
When carbon (coal) is burnt inlimited presence of oxygen, carbon monoxide (CO) is produced.

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