Chemical Reaction Engineering
In case of staged packed bed reactors carrying out exothermic reaction, use

Plug flow for dilute liquid requiring no large preheating of feed
Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature
All of these
High recycle for pure gas

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

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

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