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Assertion (A): Measuring the time for complete conversion at two particle sizes helps identify the controlling resistance.
Reason (R): The three resistances give different powers of the radius.

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

Answer: C

Both are true and the reason gives the diagnostic: a linear dependence points at film or reaction control and a square dependence at ash layer diffusion. Two sizes are enough to distinguish them. The exponent on radius is the clue.

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