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

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
Very high temperature should be used throughout the reaction

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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
Plug flow for dilute liquid requiring no large preheating of feed
All of these
High recycle for pure gas

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Chemical Reaction Engineering
For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant

Increases with pressure
Is independent of pressure
Decreases with pressure
Increases /decreases with pressure depending on the stoichiometric co-efficients of the reaction

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