____________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction ?
Correct answer: B. Chemical reaction
- A. Gas film diffusion
- B. Chemical reaction
- C. Ash diffusion
- D. None of these
Explanation
For a highly temperature-sensitive fluid-solid reaction, the chemical reaction step has the greatest temperature dependence and therefore controls the overall rate. Diffusion through the gas film or ash layer is less temperature sensitive, so it is not the controlling step here.
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