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

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

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Chemical Reaction Engineering
For all positive reaction orders for a particular duty,

Density variation during reaction affects design
Mixed reactor is always larger than the plug-flow reactor
Reactor size is independent of the type of flow
Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order

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