Chemical Reaction Engineering
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.

Diffusion through ash layer
Either A, B or C
Film diffusion
Chemical reaction

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Chemical Reaction Engineering
A Catalyst

Shortens the time to reach the equilibrium
Increases the equilibrium concentration of the product
None of these
Changes the equilibrium constant of the reaction

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Chemical Reaction Engineering
Pick out the wrong statement pertaining to space velocity of flow reactors.

The space velocity of 3 hr⁻¹ means that one third reactor volume of feed at specified conditions are being fed into the reactor
The unit of space velocity is (time)⁻¹
None of these
The space velocity of 3 hr⁻¹ means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour

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