Question:
The allotrope of carbon formed when hydrocarbons are burnt in limited supply of air is:
The allotrope of carbon formed when hydrocarbons are burnt in limited supply of air is:
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Limited oxygen supply leads to soot (carbon black) formation.
Updated On: Jun 19, 2026
- Charcoal
- Carbon black
- Coke
- Graphite
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The Correct Option is B
Solution and Explanation
Step 1: Understanding incomplete combustion.
When hydrocarbons burn in limited supply of oxygen, complete combustion does not occur. Instead, fine carbon particles are formed.
Step 2: Formation of carbon black.
These fine particles of carbon are known as carbon black or soot.
Step 3: Distinguishing other forms.
Charcoal and coke are formed from destructive distillation of organic materials, not direct combustion. Graphite is a crystalline allotrope formed naturally.
Step 4: Identifying correct option.
Thus, incomplete combustion of hydrocarbons produces carbon black.
Step 5: Final conclusion.
Hence correct answer is carbon black.
Final Answer: \[ \boxed{\text{Carbon black}} \]
When hydrocarbons burn in limited supply of oxygen, complete combustion does not occur. Instead, fine carbon particles are formed.
Step 2: Formation of carbon black.
These fine particles of carbon are known as carbon black or soot.
Step 3: Distinguishing other forms.
Charcoal and coke are formed from destructive distillation of organic materials, not direct combustion. Graphite is a crystalline allotrope formed naturally.
Step 4: Identifying correct option.
Thus, incomplete combustion of hydrocarbons produces carbon black.
Step 5: Final conclusion.
Hence correct answer is carbon black.
Final Answer: \[ \boxed{\text{Carbon black}} \]
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