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Question
When sufficient oxygen is not available, combustion of methane produces ______ gas and water.
Options:
A .  carbon dioxide
B .  carbon monoxide
C .  hydrogen
D .  nitrogen
Answer: Option B
:
B
Incomplete combustion takes place when sufficient amount of oxygen is not present. Incomplete combustion of fuels containing carbon like wood, coal, methane, petroleum, etc releases carbon monoxide (CO) gas which is a very poisonous gas.

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