Complete combustion produces a clean, often blue, flame and primarily carbon dioxide and water. Incomplete combustion produces a yellow, luminous, and sooty flame, along with carbon monoxide and unburnt carbon particles (soot), which appear as black smoke. The likelihood of incomplete combustion depends on the fuel type and the oxygen supply.
While burning hydrocarbon fuels, if we see a yellow flame with lots of black smoke, it means that the fuel is :
Asked in UPSC CDS 1 2022 · Topic: Hydrocarbons (Alkenes: Preparation, Physical and Chemical Properties)
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