While burning hydrocarbon fuels, if we see a yellow flame with lots of black smoke, it means that the fuel is :
- A. made of saturated hydrocarbons.
- B. made of unsaturated hydrocarbons. ✓
- C. burning completely.
- D. wet.
Correct Answer: B. made of unsaturated hydrocarbons.
Explanation
Unsaturated hydrocarbons generally exhibit a yellow, sooty flame due to incomplete combustion resulting from a higher percentage of carbon.
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