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A catalyst pellet has an effectiveness factor of 0.4. What fraction of its potential activity is being realised?

  • A.60 per cent
  • B.4 per cent
  • C.140 per cent
  • D.40 per cent

Answer: D

The factor is by definition the ratio of actual to potential rate. A value this low means most of the pellet interior is contributing very little and smaller particles would be better. Most of the interior sits idle at this value.

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