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State whether the following is true or false.
A washout of a well-mixed tank removes the last of the solute in a finite time.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: C

The concentration falls exponentially and approaches zero without ever reaching it, so a specification must state an acceptable residual. Draining and refilling is the practical alternative when a true zero is required.

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