Chemical Reaction Engineering
In the fluid catalytic cracker (FCC), the cracking reaction is __________ (i) and the regeneration is ____________ (ii)

(i) endothermic (ii) enodthermic
(i) exothermic (ii) exothermic
(i) exothermic (ii) endothermic
(i) endothermic (ii) exothermic

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Chemical Reaction Engineering
For a heterogeneous catalytic reaction

A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important
The surface of the catalyst does not play an important role during reaction
The catalyst does not form an intermediate complex with the reactant
Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction

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Chemical Reaction Engineering
In an ideal mixed reactor (at steady state), the

Composition throughout the reactor remains same
Exit stream has the same composition as the fluid within the reactor
Space time is equivalent to holding time for constant density systems
All of these

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Chemical Reaction Engineering
A space time of 3 hours for a flow reactor means that

The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours
Conversion is cent per cent after three hours
It takes three hours to dump the entire volume of the reactor with feed
Three reactor volumes of feed can be processed every hour

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