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
A space velocity of 5 hr⁻¹ means that

Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
After every 5 hours, reactor is being filled with the feed
Cent per cent conversion can be achieved in at least 5 hours
A fixed conversion of a given batch of feed takes 5 hours

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Chemical Reaction Engineering
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

Very high temperature should be used throughout the reaction
None of these
Temperature should be high in the beginning and decreased towards the end of the reaction
Very low temperature should be used throughout the reaction

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