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The progressive conversion model is appropriate when

  • A.the solid is highly porous throughout
  • B.the solid is dense and quite non-porous
  • C.no reaction occurs at all in it
  • D.the fluid is a liquid rather than a gas

Answer: A

Reaction then proceeds everywhere at once and the particle keeps its size while its composition changes. The two models are the extremes of a range and real particles often lie between them. The particle keeps its size in this model.

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