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As a shrinking core reaction proceeds, the ash layer resistance

  • A.falls away as the layer thickens
  • B.stays quite constant throughout
  • C.disappears entirely in the end
  • D.grows as the layer thickens

Answer: D

The diffusion path lengthens as the core shrinks, so the rate falls even at constant conditions. This is why ash diffusion control gives such a strong dependence on particle size. The path lengthens as the core shrinks.

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