Chemical Reaction Engineering
The energy of activation of a chemical reaction

Is the minimum energy which the molecules must have before the reaction can take place
Varies as fifth power of the temperature
Both B and C
Is same as heat of reaction at constant pressure

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

All of these
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
High recycle for pure gas

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