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Consider the following statements about what an RTD determines.
1. It determines conversion exactly for a first order reaction.
2. It bounds the conversion for other orders without fixing it.
3. It determines conversion exactly for any rate law.

  • A.1 only
  • B.All of them
  • C.1 and 2 only
  • D.3 only

Answer: C

Correct answer: 1 and 2 only

Statements 1 and 2 are correct: for a first order reaction the distribution fixes the conversion exactly, and for any other order it gives only the bounds set by the two micromixing limits. Statement 3 claims the general case, which the previous item denies - the distribution is a necessary input but not a sufficient one once the rate law is non-linear.

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