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Mixed control, where two resistances are comparable, shows itself as

  • A.a straight line on all of the three plots
  • B.no reaction taking place at all
  • C.a rate independent of the temperature
  • D.curvature on every single plot

Answer: D

None of the simple forms fits, so the data must be treated with the full model. Systems commonly shift from reaction to ash diffusion control as the layer thickens. The full model is then needed. Curvature on all three plots is the sign.

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