Multiple choice

Which of the following does not vaporize on burning?

  1. Charcoal

  2. Wax

  3. Kerosene oil

  4. Wood

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Charcoal does NOT vaporize when burned - it undergoes solid-to-gas combustion where carbon directly reacts with oxygen, producing CO2 without passing through a liquid or vapor phase. Wax, kerosene, and wood all vaporize first (solid/liquid → gas) before burning - the combustion occurs in the gas phase. This is why charcoal leaves ash residue while the others burn away more completely.

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