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Assertion (A): The rate of a shrinking core reaction under ash diffusion control falls as conversion proceeds.
Reason (R): The diffusion path through the product layer lengthens as the core shrinks.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both are true and the reason gives the mechanism, and the last part of the conversion therefore takes disproportionately long, which matters greatly when a high conversion is required. The last stages take the longest.

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