A gaseous fuel in order to develop luminosity on burning, must contain __________________?
Correct answer: B. Hydrocarbons
- A. Carbon monoxide
- B. Hydrocarbons
- C. Hydrogen
- D. Oxygen
Explanation
Luminosity in a fuel flame comes mainly from incandescent carbon particles formed by cracking heavy hydrocarbons. Carbon monoxide and hydrogen burn with nearly non-luminous flames, while oxygen is not a fuel component that produces luminosity.
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