Why can unsaturated hydrocarbons give a more sooty flame?
Answer and explanation
Correct answer: Because they may have higher carbon proportion and combustion can be incomplete
Soot consists mainly of tiny unburnt carbon particles. Unsaturated hydrocarbons contain carbon-carbon double or triple bonds and often have a relatively higher carbon proportion than saturated compounds with comparable hydrogen content. If oxygen is insufficient or mixing is poor, combustion is incomplete; carbon particles then remain incandescent and produce a yellow, smoky, sooty flame. The other options contradict the composition of hydrocarbons or combustion chemistry.
Frequently asked questions
What is the correct answer to this question?
Because they may have higher carbon proportion and combustion can be incomplete
Why is this the correct answer?
Soot consists mainly of tiny unburnt carbon particles. Unsaturated hydrocarbons contain carbon-carbon double or triple bonds and often have a relatively higher carbon proportion than saturated compounds with comparable hydrogen content. If oxygen is insufficient or mixing is poor, combustion is incomplete; carbon particles then remain incandescent and produce a yellow, smoky, sooty flame. The other options contradict the composition of hydrocarbons or combustion chemistry.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Carbon and its Compounds. Topic: Hydrocarbons.
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