Chemical Reaction Engineering
Considering the endotheomic dissociation of CaCO₃ in a closed vessel (CaCO₃ ⇋ CaO + CO₂), the pressure of CO₂ increases, if

An inert gas is pumped keeping the temperature constant
A catalyst is added
The temperature is increased
None of these

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Chemical Reaction Engineering
A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m³ and volumetric flow rate 1m³ /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m³ . The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 kmole/m³ , the volume of the mixed flow reactor should be increased by a factor of

7
44015
6
3

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

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

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