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The shrinking core model assumes that reaction occurs

  • A.in the gas phase alone
  • B.at a sharp boundary that moves inward
  • C.uniformly throughout the particle
  • D.only at the outer surface

Answer: B

An unreacted core shrinks while a layer of product ash grows around it. The progressive conversion model is the alternative, where the fluid penetrates everywhere and reacts throughout. A front moves inward in the core model.

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