________________ resistance is not involved in the combustion of a carbon particle?
Correct answer: B. Ash
- A. Gas film
- B. Ash
- C. Chemical reaction
- D. None of these
Explanation
Carbon combustion produces gaseous products such as CO or CO₂, not a solid ash layer that must be penetrated. Thus gas-film transport and surface chemical reaction may resist the process, but ash-layer diffusion is not inherently involved.
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