Question

Which one of the following gases is used in combustion? O ( (a) Hydrogen ) (b) Oxygen (c) Nitrogen (d) Carbon dioxide (​

Answer 1

Answer:Oxygen.

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Answer 2

(b) Oxygen is used in the combustion

Explanation:

• Fires require at least 16 percent oxygen content to burn. While burning, fuel reacts with oxygen from the surrounding, releasing heat, light and generating combustion products like gases, smoke, embers, etc.
• Oxygen is supplied by air for combustion. The waste products from the combustion process are water and carbon dioxide and Carbon Monoxide ($CO$) is formed if combustion is incomplete.