Chemical Reaction Engineering
Velocity of a reaction depends upon the

All of these
Concentration of the reactants
Temperature at which the reaction is carried
Nature of the reactants

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

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

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